A final push by parties intent on keeping Marine Le Pen ’s far-right National Rally out of power gained momentum ahead of Sunday’s legislative election, as key political figures warned voters their decision would dramatically alter France.

President Emmanuel Macron ’s centrist alliance and the left-wing New Popular Front coalition strategically pulled more than 200 candidates from runoff ballots to avoid splitting opposition to the far right. A Toluna-Harris Interactive poll conducted Tuesday and Wednesday showed the National Rally would get between 190 and 220 seats, far less than the 289 needed for an outright majority.