As he left the interview Thursday afternoon, Mulvaney told reporters, “I haven’t talked to anybody in the White House in a long time,” when asked if he talked to anybody in the White House between December 2020 and the attack on Capitol Hill. CBS News earlier reported on Mulvaney’s appearance. Rep. Liz Cheney, who serves as the committee’s vice chair, told CNN over the weekend that the committee would likely talk to more people related to the former president. The Wyoming Republican said the committee had “several interviews lined up. We expect to speak with additional members of the President’s cabinet. We expect to speak with additional members of his campaign.” The committee is also in talks with former Secretary of State Mike Pompeo and could sit down for a closed-door panel testimony as soon as this week, multiple sources familiar with the committee’s schedule tell CNN. Pompeo’s possible appearance comes as the committee has shown increased interest in former Trump cabinet members. Another source connected to the committee’s investigation told CNN they are particularly interested in conversations around the 25th Amendment after the events of January 6. In the immediate aftermath of the attack, a growing number of Republican leaders and Cabinet officials told CNN they believed Trump should be removed from office before Jan. 20. Invoking the 25th Amendment would have required then-Vice President Mike Pence and a majority of the Cabinet to vote to remove Trump from office because of his inability to “discharge the powers and duties of his office” — an unprecedented step . This story has been updated with additional information. CNN’s Annie Grayer contributed to this report.