WASHINGTON — Michael Flynn appeared before the House committee investigating the Jan. 6 attack on the Capitol on Thursday, in response to a subpoena asking him to testify about an Oval Office meeting at which, the panel said, then-President Donald Trump and others discussed seizing voting machines, several people familiar with the matter told NBC News.

Flynn did not answer the committee’s questions, exercising his 5th Amendment right on the advice of counsel, his lead attorney, David Warrington, said in a statement.