Prosecutors said the act was likely in retaliation for the January 2020 strike that killed Qassem Soleimani, who was the head of Iran's elite Quds Force.

The complaint is the latest salvo in a contentious relationship between Trump and the hawkish Bolton, who was abruptly forced from the White House in January after repeated disagreements on national security matters.

Highlights of Monday's session and what's ahead as senators conduct just the third impeachment trial of a president.