However, Macron still has a large mandate, and that opens the door for some really bad policies.
Valls, a centrist member of the Socialist Party who previous year in a speech called anti-Zionism a form of anti-Semitism and who in 2009 said he has an "eternal bond" with the Jewish people because of his marriage to a Jewish woman, narrowly beat the far-left politician Jean-Luc Melenchon, who has been accused of espousing anti-Semitic rhetoric in speeches, in the Essone region in northern France.
Macron will need to keep the diverse and politically raw group of lawmakers united behind him as he sets out to overhaul the labour code, cut tens of thousands of public-sector jobs and overhaul an unwieldy pension system. ("Forward!") past year before he ran for the French Presidency.
Marine Le Pen had said her father would not be welcome at the meeting of the party's leadership.
Mr Macron's party has filled the political space created by the disarray within the Socialists and the Republicans.
There was also a very high number of first-time MPs - around three quarters of the parliament seats went to people who had never sat in the National Assembly before. It's a largely symbolic move required after legislative elections.
President Emmanuel Macron was poised to forge ahead with pro-EU, business-friendly reforms on Monday after his centrist party redrew France's political map with a resounding victory in parliamentary elections.
The only thing that somewhat dims the En Marche! victory is a record low voter turnout.
Ligue 1: La Linguère de Saint-Louis risque la relégation
Le leader et champion de la Ligue 1, Génération foot, a poursuivi dans sa lancée victorieuse en battant (2-1) AS Douanes. L'USO a fait un bon voyage en allant battre (1-0) la Linguère, à Saint-Louis.
Though lower than forecast by pollsters in the run-up to the vote, Macron's majority swept aside France's main traditional parties, humiliating the Socialist and conservative The Republicans party that alternated in power for decades.
The former ruling Socialists fell down to an all-time low of 29 seats, losing 287 seats. "The president of the Republic has all the powers", Jean-Christophe Cambadelis said late on Sunday after announcing he would step down as Socialist Party chief.
"Tonight, the collapse of the Socialist Party is beyond doubt".
Les Republicains ("The Republicans"), the mainstream conservative party in France, also sank to an all-time low of 137 seats, losing 92, according to early election results.
It wasn't all good news for Macron. Jean-Luc Melenchon's far-left La France insoumise (Unbowed France) party and its Communist supporters will hold around 27 seats.
Female parliamentary representation has increased steadily in France in recent years, with the 2012 elections seeing a record 155 women - 26.9 percent - voted in, up from 18.5 percent in the 2007 elections and 12.3 percent in 2002.
This means the 42% of votes won by REM candidates account for less than 20% of registered voters.
Many observers suggested voters were tired of elections after four in the space of two months.
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