It seems that the boycott of Marine Le Pen has been broken, due to the great power she has gained:

Marine Le Pen, the huge winner of the European Parliament elections, is pledging to form a "unity government" if her party wins the parliamentary elections, and the French love that message. 

Earlier this week, the chairman of the conservative Republican Party, Eric Ciotti, called for a nationwide alliance with Le Pen's party in the upcoming elections.