Legal scholar Alan Dershowitz writes in a new book that the Supreme Court could intervene if President Trump is impeached, overturning a congressional vote to remove him from office for “collusion” with Russia during the 2016 election.

Even if public evidence of collusion were to emerge, the Harvard Law School professor emeritus writes in “The Case Against Impeaching Trump” that it would not be a crime, contending Trump could collude to let Russia retake Alaska without grounds for removal from office.