Republican lawmakers on the House Judiciary Committee are now weighing whether to pursue contempt measures against Page, who first came to their attention over a series of anti-Trump text messages she exchanged with Peter Strzok, then a top Federal Bureau of Investigation counterterrorism official, with whom she was having an affair.
The revelation came after Page's lawyer claimed she "will cooperate with this investigation", even as Page defied that subpoena to appear on Wednesday before the House Judiciary and Oversight and Government Reform Committees.
Mueller, a Republican, removed Strzok from the inquiry when he learned about the text exchanges and Page has left the Federal Bureau of Investigation.
"The idea that Lisa Page has something to hide is laughable, because Congress has already released her personal text messages for all the world to see", said Josh Campbell, CNN analyst and former Federal Bureau of Investigation supervisory special agent.
"How can the Rigged Witch Hunt proceed when it was started, influenced and worked on, for an extended period of time, by former FBI Agent/Lover Peter Strzok?".
Page's attorney said that she and Page did not have enough time to prepare for the meeting, and that the Federal Bureau of Investigation was less than accommodating when they went to go over materials had been given to Congress.
"This is the Federal Bureau of Investigation we're talking about - that is treason", Trump said. "That is a treasonous act".
House Speaker Paul Ryan of Wis., speaks following a House Republican Conference meeting on Capitol Hill in Washington, Wednesday, July 11. Should they actually attempt to hold Page in contempt, Nadler said, a judge would "throw it out", because she had not been given enough time to review documents.
"It appears that Lisa Page has something to hide", he said.
Judiciary committee chair Bob Goodlatte (R-Va.) didn't buy it. But a subpoena to testify before Congress is not optional.
A report by the Justice Department's internal watchdog released last month detailed the inflammatory texts between the two, including an exchange in which Strzok wrote "we'll stop it" in reference to a potential Trump election win.
"She has known for months that the House Judiciary Committee has sought her testimony as part of our joint investigation with the Oversight Committee into decisions made by the Justice Department in 2016, and she has no excuse for her failure to appear", Goodlatte said.
Members of the committee, especially Republicans and Trump defenders, had hoped to have Page's testimony before Strzok appears publicly on Thursday.
The Judiciary and Oversight panels have already spent much of the summer holding hearings and interviews critical of the Federal Bureau of Investigation and Justice Department. Trump tweeted late Wednesday.
In one message on August 8, 2016, Strzok reassured Page that she needn't worry about Trump winning the White House.
The Judiciary committee issued a subpoena Saturday for Page to appear Wednesday, according to Jeffress.
Most recently, Deputy Attorney General Rod Rosenstein fended off such accusations from top Republican Reps.