Cipollone and former deputy White House counsel Pat Philbin previously met with committee investigators for an informal interview in April.
Cipollone was one of the few aides who was with then-President Donald Trump in the West Wing on Jan. 6. ABC News previously reported that in the days following the attack on the Capitol, he advised Trump that Trump could potentially face civil liability in connection with his role encouraging supporters to march on the Capitol.
According to sources, there are a number of circumstances that could serve to complicate any eventual appearance by Cipollone — including the issue of who questions him and for how long; whether there are any ongoing issues of privilege; and whether Trump would approve of his appearance.
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