›Columbia Law School professor explains what it takes for a president to be impeached
politics01:32Columbia Law School professor explains what it takes for a president to be impeachedFormer President Donald Trump is the only president to have been impeached twice by the House of Represe...ntatives. The House impeached Trump on a charge of "incitement of insurrection" related to the deadly Capitol siege on January 6. Trump's second Senate impeachment trial begins Tuesday. Columbia Law School's professor of legislation Richard Briffault explains how the impeachment process works.