Stuart Stevens, the top adviser to Mitt Romney’s failed 2012 presidential bid, said all the rules of politics would have to be wrong for Republican frontrunner Donald Trump to become president, in an interview with New York magazine published Wednesday.

Reporter Gabriel Sherman talked with Stevens about Obama’s legacy, the 47-percent video, the current campaign of former Florida Gov. Jeb Bush and the possibility of a Trump White House.

Stevens first replied with laughter.

“He’s not. He’s not!” Stevens told New York. “This goes down to, how am going to play in the next Super Bowl? It’s not going to happen. For Donald Trump to win, everything we know about politics has to be wrong. And I don’t think it is. The timing of when it falls apart is always more difficult to know than inevitably that it will.

Read the full interview here.