President Trump is calling the House impeachment inquiry the single biggest witch hunt in American history. So what does it take to impeach a sitting president? We asked Hamline University Political Science Professor David Schultz:

“The House of Representatives must conclude by a majority vote that there is at least one article of impeachment or one reason for why the president of the United States should be impeached. Grounds for impeachment in the Constitution are; bribery, treason or high crimes and treason.”

If the house votes on at least one article of impeachment then there must be a trial in the Senate. A two-thirds majority in the senate is then required to convict a president of the impeachment and remove them from office.