The federal House of Representatives can impeach a party with a simple majority of the House members present or such other criteria as the House adopts in accordance with Article One, Section 2, Clause 5 of the United States Constitution. This triggers a federal impeachment trial in the United States Senate, which can vote by a 2/3 majority to convict an official, removing them from office. The Senate can also further, with just a simple-majority vote, vote to bar an individual convicted in a senate impeachment trial from holding future federal office.

~ https://en.wikipedia.org/wiki/Impeachment_in_the_United_States

or see https://www.usa.gov/impeachment