Zimbabwe's opposition has walked out of parliament during President Emmerson Mnangagwa's state of the nation address as politics remain tense after a disputed election.

MDC party lawmakers say the president was not legitimately elected on July 30.

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Zimbabwean President Emmerson Mnangagwa inspects the guard of honour during the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Zimbabwe's opposition has walked out of parliament during President Emmerson Mnangagwa's state of the nation address as politics remain tense after a disputed election.

Zimbabwean President Emmerson Mnangagwa arrives for the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Mnangagwa vows to fight an outbreak of the "medieval" disease of cholera that has killed 31 people, with over 5,000 cases reported. He says his government will modernize collapsing health facilities and improve water and sanitation infrastructure.

Members of the army band play upon the arrival of Zimbabwean President Emmerson Mnangagwa at the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Members of the army band play upon the arrival of Zimbabwean President Emmerson Mnangagwa at the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

An armed soldier stands guard as Zimbabwean President Emmerson Mnangagwa arrives for the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

An armed soldier stands guard as Zimbabwean President Emmerson Mnangagwa arrives for the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Zimbabwean President Emmerson Mnangagwa arrives for the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Zimbabwean President Emmerson Mnangagwa arrives for the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Tuesday's speech was Mnangagwa's first to parliament since the election many hoped would set the impoverished southern African nation on a new course after the fall of longtime leader Robert Mugabe.

Zimbabwean President Emmerson Mnangagwa inspects the guard of honour during the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Zimbabwean President Emmerson Mnangagwa inspects the guard of honour during the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Mnangagwa vows to fight an outbreak of the "medieval" disease of cholera that has killed 31 people, with over 5,000 cases reported. He says his government will modernize collapsing health facilities and improve water and sanitation infrastructure.

The president also commits his government to resolving worsening economic problems and fighting corruption while continuing to use a multi-currency system dominated by U.S. dollars.

Zimbabwean President Emmerson Mnangagwa arrives for the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Zimbabwean President Emmerson Mnangagwa arrives for the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Members of the army band play upon the arrival of Zimbabwean President Emmerson Mnangagwa at the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Members of the army band play upon the arrival of Zimbabwean President Emmerson Mnangagwa at the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

An armed soldier stands guard as Zimbabwean President Emmerson Mnangagwa arrives for the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

An armed soldier stands guard as Zimbabwean President Emmerson Mnangagwa arrives for the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Zimbabwean President Emmerson Mnangagwa arrives for the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)

Zimbabwean President Emmerson Mnangagwa arrives for the opening of the first session of the 9th Parliament in Harare, Tuesday, Sept, 18, 2018. Zimbabwe's opposition walked out of parliament as Mnangagwa delivered a State of the Nation Address as politics remain tense after a disputed election. (AP PhotoTsvangirayi Mukwazhi)