'NITWIT!' Former Nixon White House counsel slams Trump for not knowing how impeachment works
Nixon White House counsel John Dean. Image via screengrab.

On Wednesday, former White House Counsel John Dean laid into President Donald Trump on Twitter, calling him a 'nitwit' for his failure to understand how impeachment works:

Dean, who served under President Richard Nixon and became a star witness for the Watergate investigation, has frequently been critical of Trump.

Legal experts have dismissed Trump's threat to fight impeachment at the Supreme Court as ridiculous. The Constitution gives the Supreme Court no role in impeachment, other than the chief justice ceremonially presiding over the Senate trial.