CNN reported that whistleblower’s complaint was delivered Wednesday afternoon to Capitol Hill for lawmakers to review.
The complaint is about President Donald Trump’s communications with Ukraine.
It gave lawmakers their first chance to see the classified account that spurred a formal impeachment inquiry.
Trump has downplayed the significance of the complaint, claiming the whistleblower is partisan.
According to the Los Angeles Times, Trump took a threatening tone in a private event.
“You know what we used to do in the old days when we were smart? Right? The spies and treason, we used to handle it a little differently than we do now.” the President said Wednesday.
The full whistleblower complaint was made public a short time later.