France will not tolerate repeated extensions of the Brexit deadline, a French presidential adviser said, expressing hope that European elections in Britain would jolt its political parties into reaching a deal on leaving the EU.

“We must not get sucked into repeated extensions, that’s for sure,” the adviser said. “Our message is clear: a solution must have been found by October 31.”

The French adviser did not close the door on a further extension beyond Oct. 31, but made clear France would continue to argue against delaying talks repeatedly. “Maybe European elections (in Britain) will serve as a shock to reach a transpartisan deal,” the adviser said.