Leaders of major world economies are meeting to discuss the shaky world economy amid trade disputes and uncertainty over U.S. President Donald Trump's policies.

Trump tried to play down tensions among Group of Seven leaders after they had dinner Saturday in the southwest French resort of Biarritz. He is worried that the global economic slowdown is spreading to the U.S. before next year's elections.

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Police fire gather behind their shields as they clash with protestors in Bayonne, France, Saturday, Aug. 24, 2019. World leaders and protesters are converging on the southern French resort town of Biarritz for the G-7 summit. Police have fired water cannon at about 400 anti-capitalist protesters blocking roads in a town near the venue of the G-7 summit. A few protesters threw rocks at police but the crowd in Bayonne was largely peaceful. (AP PhotoBob Edme)

Leaders of major world economies are meeting to discuss the shaky world economy amid trade disputes and uncertainty over U.S. President Donald Trump's policies.

President Donald Trump and Britain's Prime Minister Boris Johnson, right, attend a working breakfast at the Hotel du Palais on the sidelines of the G-7 summit in Biarritz, France, Sunday, Aug. 25, 2019. (AP PhotoAndrew Harnik)

Disputes on trade have unsettled the global economy because businesses don't know where tariffs will be imposed.

A protestor throws away a teargas canister fired by police in Bayonne, France, Saturday, Aug. 24, 2019. World leaders and protesters are converging on the southern French resort town of Biarritz for the G-7 summit. Police have fired water cannon at about 400 anti-capitalist protesters blocking roads in a town near the venue of the G-7 summit. A few protesters threw rocks at police but the crowd in Bayonne was largely peaceful. (AP PhotoEmilio Morenatti)

A protestor throws away a teargas canister fired by police in Bayonne, France, Saturday, Aug. 24, 2019. World leaders and protesters are converging on the southern French resort town of Biarritz for the G-7 summit. Police have fired water cannon at about 400 anti-capitalist protesters blocking roads in a town near the venue of the G-7 summit. A few protesters threw rocks at police but the crowd in Bayonne was largely peaceful. (AP PhotoEmilio Morenatti)

German Chancellor Angela Merkel, center, is greeted by President of France Emmanuel Macron, right, and wife Brigitte Macron as he arrives to the G7 Summit in Biarritz, France, Saturday, Aug. 24, 2019. (Sean KilpatrickThe Canadian Press via AP)

German Chancellor Angela Merkel, center, is greeted by President of France Emmanuel Macron, right, and wife Brigitte Macron as he arrives to the G7 Summit in Biarritz, France, Saturday, Aug. 24, 2019. (Sean KilpatrickThe Canadian Press via AP)

Britian's Prime Minister Boris Johnson, center, is greeted by President of France Emmanuel Macron, left, and wife Brigitte Macron as he arrives to the G7 Summit in Biarritz, France, Saturday, Aug. 24, 2019. (Sean KilpatrickThe Canadian Press via AP)

Britian's Prime Minister Boris Johnson, center, is greeted by President of France Emmanuel Macron, left, and wife Brigitte Macron as he arrives to the G7 Summit in Biarritz, France, Saturday, Aug. 24, 2019. (Sean KilpatrickThe Canadian Press via AP)

A protestor throws a rock at police in Bayonne, France, Saturday, Aug. 24, 2019. World leaders and protesters are converging on the southern French resort town of Biarritz for the G-7 summit. Police have fired water cannon at about 400 anti-capitalist protesters blocking roads in a town near the venue of the G-7 summit. A few protesters threw rocks at police but the crowd in Bayonne was largely peaceful. (AP PhotoEmilio Morenatti)

A protestor throws a rock at police in Bayonne, France, Saturday, Aug. 24, 2019. World leaders and protesters are converging on the southern French resort town of Biarritz for the G-7 summit. Police have fired water cannon at about 400 anti-capitalist protesters blocking roads in a town near the venue of the G-7 summit. A few protesters threw rocks at police but the crowd in Bayonne was largely peaceful. (AP PhotoEmilio Morenatti)

The G-7 leaders are meeting Sunday morning to focus on what they can do together to boost the economy. They include the heads of Britain, France, Germany, Japan, Canada and Italy.

Police fire gather behind their shields as they clash with protestors in Bayonne, France, Saturday, Aug. 24, 2019. World leaders and protesters are converging on the southern French resort town of Biarritz for the G-7 summit. Police have fired water cannon at about 400 anti-capitalist protesters blocking roads in a town near the venue of the G-7 summit. A few protesters threw rocks at police but the crowd in Bayonne was largely peaceful. (AP PhotoBob Edme)

Police fire gather behind their shields as they clash with protestors in Bayonne, France, Saturday, Aug. 24, 2019. World leaders and protesters are converging on the southern French resort town of Biarritz for the G-7 summit. Police have fired water cannon at about 400 anti-capitalist protesters blocking roads in a town near the venue of the G-7 summit. A few protesters threw rocks at police but the crowd in Bayonne was largely peaceful. (AP PhotoBob Edme)

Disputes on trade have unsettled the global economy because businesses don't know where tariffs will be imposed.

Anti-capitalist protesters also plan demonstrations Sunday after clashing with police near Biarritz on the summit's opening day Saturday.

President Donald Trump and Britain's Prime Minister Boris Johnson, right, attend a working breakfast at the Hotel du Palais on the sidelines of the G-7 summit in Biarritz, France, Sunday, Aug. 25, 2019. (AP PhotoAndrew Harnik)

President Donald Trump and Britain's Prime Minister Boris Johnson, right, attend a working breakfast at the Hotel du Palais on the sidelines of the G-7 summit in Biarritz, France, Sunday, Aug. 25, 2019. (AP PhotoAndrew Harnik)

A protestor throws away a teargas canister fired by police in Bayonne, France, Saturday, Aug. 24, 2019. World leaders and protesters are converging on the southern French resort town of Biarritz for the G-7 summit. Police have fired water cannon at about 400 anti-capitalist protesters blocking roads in a town near the venue of the G-7 summit. A few protesters threw rocks at police but the crowd in Bayonne was largely peaceful. (AP PhotoEmilio Morenatti)

A protestor throws away a teargas canister fired by police in Bayonne, France, Saturday, Aug. 24, 2019. World leaders and protesters are converging on the southern French resort town of Biarritz for the G-7 summit. Police have fired water cannon at about 400 anti-capitalist protesters blocking roads in a town near the venue of the G-7 summit. A few protesters threw rocks at police but the crowd in Bayonne was largely peaceful. (AP PhotoEmilio Morenatti)

German Chancellor Angela Merkel, center, is greeted by President of France Emmanuel Macron, right, and wife Brigitte Macron as he arrives to the G7 Summit in Biarritz, France, Saturday, Aug. 24, 2019. (Sean KilpatrickThe Canadian Press via AP)

German Chancellor Angela Merkel, center, is greeted by President of France Emmanuel Macron, right, and wife Brigitte Macron as he arrives to the G7 Summit in Biarritz, France, Saturday, Aug. 24, 2019. (Sean KilpatrickThe Canadian Press via AP)

Britian's Prime Minister Boris Johnson, center, is greeted by President of France Emmanuel Macron, left, and wife Brigitte Macron as he arrives to the G7 Summit in Biarritz, France, Saturday, Aug. 24, 2019. (Sean KilpatrickThe Canadian Press via AP)

Britian's Prime Minister Boris Johnson, center, is greeted by President of France Emmanuel Macron, left, and wife Brigitte Macron as he arrives to the G7 Summit in Biarritz, France, Saturday, Aug. 24, 2019. (Sean KilpatrickThe Canadian Press via AP)

A protestor throws a rock at police in Bayonne, France, Saturday, Aug. 24, 2019. World leaders and protesters are converging on the southern French resort town of Biarritz for the G-7 summit. Police have fired water cannon at about 400 anti-capitalist protesters blocking roads in a town near the venue of the G-7 summit. A few protesters threw rocks at police but the crowd in Bayonne was largely peaceful. (AP PhotoEmilio Morenatti)

A protestor throws a rock at police in Bayonne, France, Saturday, Aug. 24, 2019. World leaders and protesters are converging on the southern French resort town of Biarritz for the G-7 summit. Police have fired water cannon at about 400 anti-capitalist protesters blocking roads in a town near the venue of the G-7 summit. A few protesters threw rocks at police but the crowd in Bayonne was largely peaceful. (AP PhotoEmilio Morenatti)