But in 1998, Dershowitz said a president could be challenged even without being charged with a crime.
"It certainly doesn't have to be a crime if you have someone who completely corrupts the position of president and who abuses trust and who poses a great danger to our freedom, you don't need a technical crime," he said in "Larry King Live "in season.
When asked by CNN's Anderson Cooper on "Anderson Cooper 360" on Monday if he was wrong at the time, Dershowitz replied, "I was saying that I am much more correct now, after doing all the research, because that's the problem".
"I didn't do any research at that time, I relied on what the professors said … because that question was not raised in the Clinton impeachment," said Dershowitz. "Everyone knew he was accused of a crime, the question is whether it was a serious crime. Now, the question is whether a crime or criminal behavior is necessary."
He continued: "I did the research now – I was not wrong (at the time), now I am much more correct than I was at the time. I said you didn't need a technical crime at that time. You still don't think you need one. technical crime ".
The constitution says that presidents can be accused of "treason, bribery or other serious crimes and crimes", but does not define "crimes and serious crimes". Dershowitz's argument depends on the Senate agreeing that none of the charges Trump faces qualify as "criminal conduct".