DNI whistleblower complaint stems from promise Trump allegedly made in phone call to foreign leader: report
White House photo of President Donald Trump talking on the phone aboard Air Force One

On Wednesday, the Washington Post reported that the source of the whistleblower complaint currently being suppressed by the Director of National Intelligence is a phone conversation between President Donald Trump and a foreign leader.

According to the report, the whistleblower became aware that the president made a "promise" to this unspecified foreign leader, and was so disturbed by the nature of that promise that he or she filed a complaint through channels set up to help whistleblower claims involving classified information.

Congress is set to receive a briefing on the complaint from the intelligence community inspector general in a closed-door hearing on Thursday.