It's not even two months since Emmanuel Macron was convincingly re-elected as president but he is already in a crunch election that could prevent him pushing through his reforms.
French voters go to the polls on Sunday to decide who will control their National Assembly, reports BBC.
Mr Macron beat the far right in April, but this time the challenge is harder.
Far-left Jean-Luc Mélenchon leads a left-green alliance that finished neck and neck with Macron only a week ago.
They call themselves Nupes, which stands for New Ecological and Social Popular Union, and the polls suggest they could stop the president winning the 289 seats he needs for an outright majority. The centrist Macron alliance, Ensemble, portrays them as a "marriage of convenience" of Communists, Socialists, far-left Mélenchonists and Greens.
But Nupes have galvanised voters with a promise to fight spiralling prices, bring down the retirement age and tackle climate change. Green leaders and many green voters back them, accusing President Macron of doing little in the past five years.
READ: French projections: Macron's centrists will keep a majority
Sunday's second round is almost entirely made up of run-off duels between two candidates, and almost half involve the two big alliances. Several ministers in the Macron government are battling to keep their seats and hold on to their jobs, and two of the toughest fights involve Europe Minister Clément Beaune and Green Transition Minister Amélie de Montchalin.
Without an outright majority of 289 seats, Mr Macron will need the support of other parties to push through his big-ticket reforms, such as raising the retirement age, cutting taxes and reforming benefits. Pollsters suggest Ensemble will win 255-305 seats and Nupes 140-200.
As the sun went down on the campaign on Friday night, Nupes spokesman Ian Brossat told supporters in Longjumeau south of Paris: "They didn't think the left and Greens could get together - it would be chaos and catastrophe; but the chaos today is economic, with food prices going up. We've got 10 million people in poverty."