Special Counsel Robert Mueller's team is expected to interview White House communications director Hope Hicks and White House special counsel Don McGahn separately in the coming weeks while House Intelligence Committee investigators are set to speak with both Erik Prince and Attorney General Jeff Sessions this Thursday.
Representative Adam Schiff (D-CA), ranking member on the House Intelligence Committee, confirmed on MSNBC Monday night that AG Sessions will appear for questioning.
Erik Prince's testimony scheduled for 2pm to 6pm ET Thursday is described as "open in a closed space" which means it will take place in private, but the committee will release a transcript to the public afterwards like it did with Carter Page.
Congressional investigators are interested in a trip Prince took to the Seychelles in January, allegedly to meet with a Russian close to Vladimir Putin. The purpose of the meeting, arranged by the United Arab Emirates, was "to establish a back-channel line of communication between Moscow and President-elect Donald Trump."
Hicks' proximity to President Trump and her involvement in various campaign and administration decisions under scrutiny could make her a useful witness for the special counsel should she agree to be forthcoming with truthful information.
Mueller's team, investigating possible obstruction of justice, will want to ask McGahn about his role in the president's firing of FBI Director James Comey. McGahn, reportedly, read and nixed a draft letter Trump wrote explaining his real reasons for the dismissal.
McGahn also can expect to field questions about his interactions with former acting Attorney General Sally Yates who testified in May that she had warned the White House counsel and one of his aides that former national security advisor Michael Flynn had lied to the vice president and the American people about his interactions with former Russian ambassador Sergey Kislyak.
"We told them that the conduct Flynn had engaged in [speaking to Kislyak] was problematic in and of itself. We said that the vice president was entitled to know that the information he was giving the American people was not true. And we told him we were concerned that the American people had been misled about what General Flynn had done, and that we weren't the only ones who knew about this."
McGahn then asked her why the DOJ cared if "one White House official lied to another," Yates said.
She said the Russians "also knew what Flynn had done, and that he had misled the vice president and others."
Mueller is set to grill a key White House player as he examines whether Trump obstructed justice (Business Insider)
Erik Prince to Testify (CIR)
Special Counsel to Interview Hicks (CIR)
House Intelligence Committee to interview Sessions (The Hill)
Blackwater Founder Erik Prince to Testify in Russia Probe (US News & World Report)