The inspector general appeared before the House intelligence committee behind closed doors yesterday but declined to reveal to members the substance of the complaint.
The standoff raises fresh questions about the extent to which Trump's allies are protecting him from oversight and, specifically, if his new acting director of national intelligence, Joseph Maguire, is working with the Justice Department to shield the President from the reach of Congress.
Trump, though giving no details about any incident, yesterday denied that he would ever "say something inappropriate" on such a call.
Democratic Representative Adam Schiff, the chairman of the House Intelligence Committee, said he was prepared to go to court to try to force the Trump Administration to open up about the complaint.
"The inspector general has said this cannot wait," said Schiff, describing the Administration's blockade as an unprecedented departure from law. "There's an urgency here that I think the courts will recognise." Schiff said he, too, could not confirm whether newspaper reports were accurate because the Administration was claiming executive privilege in withholding the complaint. But letters from the inspector general to the committee said it was an "urgent" matter of "serious or flagrant abuse" that must be shared with lawmakers.
The letters also made it clear that Trump's new acting director of national intelligence, Maguire, consulted with the Justice Department in deciding not to transmit the complaint to Congress in a further departure from standard procedure.
Because the Administration is claiming the information is privileged, Schiff said he believes the whistleblower's complaint "likely involves the President or people around him".
- AP