The letter was sent to House Speaker Nancy Pelosi, Senate Majority Leader Chuck Schumer, Senate Minority Leader Mitch McConnell and House Minority Leader Kevin McCarthy. The House Administration Committee’s Republican staff was also sent a copy.

The whistleblower accused Pittman of lying to Congress about a key intelligence report the department received in late December. That report noted that a blog called "thedonald.win" posted a map of the Capitol campus, and that commenters on the site called for protesters to carry guns and confront members of Congress on Jan. 6.

Pittman told congressional investigators in April that a cohort of senior officials in the department were also aware of that intelligence before the attack. The whistleblower claimed in his letter, however, that other officials did not receive the intelligence report, and that Pittman lied when she said they did.