WATCH: Day 1 of the second impeachment trial of former President Donald Trump

In this image from video, Bruce Castor, an attorney for former President Donald Trump speaks during the second impeachment trial of Trump in the Senate at the U.S. Capitol in Washington, Tuesday, Feb. 9, 2021. (Senate Television via AP)
In this image from video, Bruce Castor, an attorney for former President Donald Trump speaks during the second impeachment trial of Trump in the Senate at the U.S. Capitol in Washington, Tuesday, Feb. 9, 2021. (Senate Television via AP) (Copyright 2021 The Associated Press. All rights reserved)

The impeachment trial of former President Trump began on Tuesday.