Trump's former national security advisor, who resigned the day of the Capitol riot, expected to testify at Thursday's January 6 hearing: report

• Matthew Pottinger was the deputy national security advisor for former President Donald Trump.
• He resigned on the day of the Capitol riot on January 6, 2021, along with other Trump staffers.

Former deputy national security advisor Matthew Pottinger is expected to testify before the House Select Committee investigating the January 6, 2021 Capitol riot, according to a CNN report.

Pottinger, who was appointed to the role on September 22, 2019, in the last year of the Trump administration, will testify at Thursday's primetime hearing, CNN reported, citing multiple unnamed sources.

He is expected to appear with Sarah Matthews, the deputy press secretary during the Trump administration.

Pottinger was one of several staff members of the Trump White House to resign after the January 6 attack on the Capitol.

Prior to the riot, Pottinger initially had plans to resign on the day of the election but was convinced by National Security Advisor Robert O'Brien to stay for the transition, according to an Axios report.

The January 6 attack on the Capitol was Pottinger's breaking point.

In a deposition that was played on the day of Cassidy Hutchinson's testimony before the House Select Committee, Pottinger told investigators that he made a decision to resign after Trump tweeted that former Vice President Mike Pence "didn't have the courage" to overturn the election results.

"I read that tweet and made a decision at that moment to resign," he said in the deposition. "That's where I knew I was leaving that day, once I read that tweet."

The committee did not respond to Insider's request for confirmation on the report.

Pottinger is now a research fellow at the Hoover Institution, which did not respond to Insider's request for comment.