Bill De Blasio, the mayor of America’s largest city and a candidate or the 2020 Democratic presidential nomination, said Friday on MSNBC’s “Morning Joe” that the president must be impeached because his comments about whether he would accept “foreign dirt” on a political opponent in an interview Wednesday with ABC News are “openly treasonous.”

“I’ve said for a long time that I’m concerned that Democrats need to start talking about the issues and not just impeachment,” de Blasio said, “But what happened the other day changed my mind because that was treason.”

“What he said was openly treasonous. It was an invitation to hostile foreign governments to find information on American leaders and give it to Donald Trump to help Donald Trump.”