WASHINGTON • The U.S. House of Representatives Select Committee investigating the Jan. 6 riot at the Capitol has subpoenaed four former members of Donald Trump’s administration, including Mark Meadows and Steve Bannon, the panel’s chairman said on Thursday.

Former White House Deputy Chief of Staff Dan Scavino and former Defense Department official Kash Patel were also subpoenaed and instructed to produce materials and appear for depositions, committee Chairman Bennie Thompson said in a statement.

Meadows, a former congressman, served as Trump’s White House chief of staff. Bannon was a White House adviser to Trump. A representative for Meadows said he declined to comment. Bannon and Scavino could not be reached for immediate comment.

Patel said in a statement he was “disappointed, but not surprised” the committee issued a subpoena before seeking his voluntary cooperation.

A mob of Trump supporters stormed the Capitol on Jan. 6 as Congress was meeting to certify Democrat Joe Biden’s election victory, delaying that process for several hours as then-Vice President Mike Pence, members of Congress, staff and journalists fled.

Nearly 600 people have been arrested on charges tied to the attack.

Thompson said Meadows reportedly communicated with state and federal officials as part of an effort to overturn the 2020 election or prevent Biden’s certification. Meadows was also reportedly in communication with organizers of the Jan. 6 rally, Thompson said.

‘In a letter to Bannon, Thompson noted that he had been involved with multiple conversations about persuading members of Congress to block certification of Trump’s election defeat.

“You are quoted as stating, on Jan. 5, 2021, that ‘all hell is going to break loose tomorrow,’” Thompson wrote. “Accordingly, the select committee seeks both documents and your deposition testimony.”

Bannon was fired by Trump August 2017 but they later mended fences and stayed in contact. Trump pardoned Bannon after he was charged with swindling the president’s own supporters over an effort to raise private funds to build a border wall.

Meadows and Scavino have been instructed to appear for depositions on Oct. 15 and Bannon and Patel on Oct. 14.