"[Le Pen] will not be able to have many lawmakers at the legislative elections because she does not have any allies (except for [Nicolas] Dupont-Aignant) and lost her credibility", di Borgo said.
It was the first time the men had appeared in public together since Macron resigned in August 2016 as Hollande's economy minister to run for president - a decision that was received coldly by the French leader at the time, according to French media.
After his victory on Sunday night, Merkel praised the success of Macron and his independent, politically centrist En Marche! movement.
Anti-capitalist candidate Melenchon - who won seven million votes in the April 23 first round - is also angling for the consolation prize of opposition leader.
Although many across Europe were relieved that the anti-immigrant euroskeptic National Front (FN) leader Le Pen was defeated, many in France felt deflated after they felt they had chosen "the lesser of two evils", as one French voter put it to DW. The ceremony marked decades of peace in Western Europe, something Macron made a cornerstone of his campaign against Le Pen's brand of nationalist populism.
Emmanuel Macron's pledge to transform the French political landscape moved closer to fulfilment today when a former Socialist prime minister said that he was joining his camp.
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With virtually all votes counted, Macron had topped 66 percent against just under 34 percent for Le Pen - a gap wider than the 20 or so percentage points that pre-election surveys had suggested. Sylvie Goulard, a French deputy to the European Parliament, said Macron would make Berlin his first official visit, with perhaps a stop to see French troops stationed overseas as well.
Mainstream parties on the left and right that were frozen out of Sunday's runoff in a first for modern France, also are regrouping, aiming to clip Macron's wings and impose their political agenda, via parliament, on his five-year term.
His centrist En Marche (On the Move) movement, barely a year old, has said it will field candidates in every constituency in the two-round election in June.
"The Socialist Party is dead; it's in the past", Valls said on Tuesday.
"I call on all patriots to join us", she said.
Republicans vice-president Laurent Wauquiez emphasised Macron's vulnerability, noting he had been a grudging choice of president for many voters, who backed him only to block Le Pen.
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