Alan Dershowitz, a Harvard Law professor who has come to be known for defending President Trump, on Friday said new allegations that the Republican leader told his former personal lawyer to lie to Congress will be decided on four things.

“Recall that one of the grounds on which President Nixon was sought to be impeached was for telling subordinates to lie to the FBI. The evidence of Nixon’s crime was indisputable,” he wrote in a New York Daily News op-ed. “The evidence here does not seem as compelling, based on the BuzzFeed report, but everyone should take a deep breath and wait until all the evidence, including evidence presented by Trump’s lawyers, is in the public record.”