Former Argentine president Cristina Fernández has addressed enthusiastic supporters as her opposition ticket seeks momentum ahead of elections next month.

Fernández's appearance came after a judge ordered her to stand trial in a corruption case stemming from her time as president. No date was set. Fernández, who faces a number of investigations, denies wrongdoing.

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Former President Cristina Fernandez gestures during the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

Former Argentine president Cristina Fernández has addressed enthusiastic supporters as her opposition ticket seeks momentum ahead of elections next month.

A man holds posters featuring former President Cristina Fernandez after the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

Cristina Fernández spoke Saturday in La Matanza in Buenos Aires province.

A woman, wearing a T-shirt with the image of former President Cristina Fernandez, flashes a victory sign, after the former leader's book presentation, in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

A woman, wearing a T-shirt with the image of former President Cristina Fernandez, flashes a victory sign, after the former leader's book presentation, in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

Former President Cristina Fernandez, right, waves to supporters during the presentation of her book, in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

Former President Cristina Fernandez, right, waves to supporters during the presentation of her book, in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

A man holds a drawing of former President Cristina Fernandez during the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

A man holds a drawing of former President Cristina Fernandez during the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

People gather to see former President Cristina Fernandez after the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

People gather to see former President Cristina Fernandez after the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

Fernández is the vice presidential candidate on a slate headed by Alberto Fernández, her chief of staff when she led Argentina. The two are not related.

Former President Cristina Fernandez gestures during the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

Former President Cristina Fernandez gestures during the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

Cristina Fernández spoke Saturday in La Matanza in Buenos Aires province.

She criticized deteriorating economic conditions under President Mauricio Macri, who is struggling for support ahead of the Oct. 27 election. Some investors are concerned a Fernández victory could revive an era of heavy state intervention in the economy.

A man holds posters featuring former President Cristina Fernandez after the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

A man holds posters featuring former President Cristina Fernandez after the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

A woman, wearing a T-shirt with the image of former President Cristina Fernandez, flashes a victory sign, after the former leader's book presentation, in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

A woman, wearing a T-shirt with the image of former President Cristina Fernandez, flashes a victory sign, after the former leader's book presentation, in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

Former President Cristina Fernandez, right, waves to supporters during the presentation of her book, in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

Former President Cristina Fernandez, right, waves to supporters during the presentation of her book, in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

A man holds a drawing of former President Cristina Fernandez during the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

A man holds a drawing of former President Cristina Fernandez during the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

People gather to see former President Cristina Fernandez after the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)

People gather to see former President Cristina Fernandez after the presentation of her book in Buenos Aires, Argentina, Saturday, Sept. 21, 2019. Fernandez returns to the public eye in Argentina on Saturday in an event to present her book "Sincerely" just weeks out from presidential election in which the former two-term leader is running as vice presidential candidate in an opposition ticket. (AP PhotoNatacha Pisarenko)