Former White House counsel Pat Cipollone met for a private interview with the January 6 committee for about eight hours Friday regarding his role in trying to prevent then-President Donald Trump from challenging the 2020 presidential election and joining the violent mob that laid siege to the Capitol.

Cipollone, once a staunch presidential confidant who had defended Trump during his first impeachment trial, had been reluctant to appear formally for an on-record interview. Like other former White House officials, it is possible he claimed his counsel to the Republican president as privileged information he was unwilling to share with the committee.

It remained unclear after he left Capitol Hill Friday afternoon whether he had remained within those parameters during the hourslong interview.

Cipollone has been a sought-after witness after bombshell testimony revealed his apparently desperate and last-ditch efforts to prevent Trump’s actions. The panel was told he had warned that the defeated president would be charged with “every crime imaginable” if he went to the Capitol on January 6, 2021, trying to stop the certification of Joe Biden’s election. Cipollone was subpoenaed for his testimony.

The panel said Cipollone was “uniquely positioned to testify” in a letter accompanying the subpoena issued last week.

“Mr. Cipollone repeatedly raised legal and other concerns about President Trump’s activities on January 6th and in the days that preceded,” Chairman Bennie Thompson, a Democrat, said in a statement. “While the Select Committee appreciates Mr. Cipollone’s earlier informal engagement with our investigation, the committee needs to hear from him on the record, as other former White House counsels have done in other congressional investigations.”

FILE - Cassidy Hutchinson, former aide to Trump White House Chief of Staff Mark Meadows, testifies at the Capitol in Washington, June 28, 2022.

FILE – Cassidy Hutchinson, former aide to Trump White House Chief of Staff Mark Meadows, testifies at the Capitol in Washington, June 28, 2022.

Cipollone’s central role came into focus during a surprise committee hearing last week, when former White House aide Cassidy Hutchinson described his repeated efforts to stop Trump from joining the mob at the Capitol.

Hutchinson said Cipollone urged her to persuade her boss, White House Chief of Staff Mark Meadows, not to let Trump go to the Capitol.

Hutchinson testified that she had been told Trump was irate when he was ultimately prevented by his security team from going to the Capitol that day.

On the Sunday before the January 6 attack, Cipollone was also part of a key meeting with Justice Department officials at the White House who threatened to resign if Trump went ahead with plans to install a new acting attorney general who would pursue his false claims of voter fraud.

One witness testified to the committee that during that meeting, Cipollone referred to a proposed letter making false claims about voter fraud as a “murder-suicide pact.”

Cipollone and his attorney, Michael Purpura, who also worked at the Trump White House, did not respond to requests for comment.

Earlier this week, Trump responded to news of Cipollone’s cooperation on his social media platform, Truth Social, calling it bad for the country.