French presidential hopeful Emmanuel Macron has been heckled by factory workers in Amiens after a visit by his far-right rival, Marine Le Pen.
Ms Le Pen upstaged her centrist rival earlier by turning up to speak to the workers as he met their union representatives a few miles away.
Mr Macron, who is far ahead in opinion polls, is in Amiens, his home town, amid accusations of complacency.
He got another boost when former President Nicolas Sarkozy endorsed him.
François Fillon, the candidate of Mr Sarkozy’s own, centre-right Republican party, was knocked out in the first round, leaving uncertainty over how party supporters would vote in the second.
Opinion polls taken since the first round on Sunday suggest Mr Macron, candidate of the En Marche (On The Move) movement, will easily beat Ms Le Pen, who has temporarily stood down as leader of the National Front.
Ms Le Pen, whose new campaign slogan is “Choose France”, tweeted (in French) photos of her meeting the workers and said: “With me, their factory won’t close!”
She seeks to portray her pro-EU opponent as the candidate of “runaway globalisation”, hoping to pick up votes from the extreme left despite her own far-right background.
Leading members of the ruling Socialist Party have criticised Mr Macron, a former Socialist minister, for not fighting hard enough in the run-off campaign.
“He was smug,” Socialist Party boss Jean-Christophe Cambadelis told French radio. “He wrongly thought that it was a done deal. It’s not a done deal.”
In a statement (in French) on Facebook, Mr Sarkozy said he would vote for Mr Macron and was retiring from politics himself.
“I consider that the election of Marine Le Pen and the launch of her project will bring serious consequences to our country and to the French,” he wrote.
“I will therefore be voting in the second round of the presidential election for Emmanuel Macron. It’s a choice of responsibility, which is not in any case a support for his project.”
Source: BBC