WASHINGTON The House select committee investigating the Jan. 6 assault on the U.S. Capitol incited by former President Donald Trump has issued subpoenas to another half-dozen of his associates, including top Trump campaign aides and the author of the now-infamous memo advising then-Vice President Mike Pence to simply declare Trump the winner of the 2020 election.

John Eastman, who wrote that Pence had the unilateral authority to give Trump a second term despite Trumps loss, former campaign manager Bill Stepien and former campaign strategist Jason Miller have all been subpoenaed, as has former national security adviser and pardoned felon Michael Flynn, who advised Trump to declare martial law and force states to rerun their elections.

In the days before the January 6th attack, the former presidents closest allies and advisors drove a campaign of misinformation about the election and planned ways to stop the count of Electoral College votes, committee chairman Bennie Thompson (D-Miss.) said. The select committee needs to know every detail about their efforts to overturn the election, including who they were talking to in the White House and in Congress, what connections they had with rallies that escalated into a riot, and who paid for it all.

Trump campaign staffer Angela McCallum and Bernard Kerik, former New York City police commissioner and another Trump-pardoned felon, were also issued subpoenas.

All six have been ordered to turn over relevant documents to the committee no later than Nov. 23 and to sit for under-oath depositions late this month and through the first two weeks of December.

The Jan. 6 committee has already subpoenaed some two dozen Trump aides and allies. Most are complying, although Trumps former White House aide Steve Bannon has been held in contempt of Congress for refusing, and former Justice Department official Jeffrey Clark refused to answer numerous questions, claiming an executive privilege that the committee does not recognize.

Stepien, who managed Trumps campaign in its final months, supervised the conversion of the Trump presidential campaign to an effort focused on Stop the Steal messaging and related fundraising, according to the subpoena, which states that the campaign urged states to delay or deny certification of electoral votes and to send multiple slates of electoral votes to the United States Congress. Stepien did not respond to HuffPosts query.

Miller, another top Trump campaign official for most of 2020, repeatedly spread Trumps lies about the election in media interviews and on Bannons podcast in the weeks leading up to Jan. 6. He also crafted a statement from Trump claiming that the president and vice president were in complete agreement about Pences ability to give Trump a second term, when, in fact, Pence had been telling Trump the opposite for weeks. Miller also did not respond to a HuffPost query.

McCallum, according to her subpoena, participated in the effort to persuade Republican state lawmakers to appoint an alternate slate of electors because of the widespread election fraud, which, in fact, did not exist. She could not be reached for comment.

Eastman, then a law professor at Chapman University in Southern California, publicly and in private meetings with Trump and Pence pushed the idea that during Congresss certification of the election, the vice president could unilaterally declare some electoral votes to be invalid and thereby award Trump a second term. He spoke at the Jan. 6 rally and repeated Trumps lies about fraud to rile up the crowd. He did not respond to a HuffPost query.