Vice President Mike Pence on Tuesday told President Donald Trump that he does not have the authority to block certification of President-elect Joe Biden’s win when Congress meets to count electoral votes, sources told CNN.

Trump, who already had turned up the pressure on Pence to steal the election, warned him that it would be politically “damaging” for Pence to refuse to block certification, according to a source familiar with the conversation.

Pence gently informed Trump during the meeting that the power doesn’t exist for him to derail the process, the source added.

The vice president went on to tell Trump there are outliers saying that the authority exists, but Pence has been told by the White House Counsel’s Office he doesn’t have that authority, according to this source who was briefed on the conversation. The meeting at the White House came after Pence met with the Senate parliamentarian earlier this week to go over his role in the proceedings.