François Hollande has said he finds Donald Trump's "excesses" sickening, claimed that democracy is at stake in the 2016 US election and stated a victory for the Republican could make politics more conservative around the world, reports The Telegraph.
The French president is the latest high profile politician to condemn Mr Trump after the billionaire businessman attacked the parents of a Muslim American soldier killed in Iraq.
"His excesses make you want to retch, even in the United States, especially when - as was Donald Trump's case - he speaks ill of a soldier, of the memory of a soldier," Mr Hollande said.
Mr Trump's attacks on the parents of the decorated soldier have been widely criticised by both Republicans and Democrats in the US - and have provoked disbelief around the world.
He also suggested Khizr Khan's wife, Ghazala, had not been allowed to talk when the couple appeared at the Democratic National Convention.
Mr Hollande criticised Mr Trump's "hurtful and humiliating comments".
"Democracy is also at stake, as we see more and more people tempted by authoritarianism," he said, "especially" in the United States.
"Should the American people choose Trump, there will be consequences, because a US election is a global election," he added.
President Barack Obama issued a direct challenge to Republicans on Tuesday to distance themselves from the billionaire businessman, calling him "woefully unprepared" for the job of president.