The Hutchinson Testimony Is a Key Witness for the Department of Justice.

Former Trump White House aide Cassidy Hutchinson is cooperating with the Justice Department’s criminal investigation into the January 6 attack on the Capitol and the efforts to interfere with the 2020 presidential election. Laurence Tribe is a Harvard Law School professor and the co-author of "To End a Presidency: The Power of Impeachment." He joins AC360 to discuss the scope and focus of the federal investigation.

Plus, CNN has exclusively learned that the Biden administration has offered to exchange a convicted Russian arms trafficker serving a 25-year U.S. prison sentence for the release of Americans Paul Whelan and WNBA star Brittney Griner. Abby Phillip interviewed Griner’s wife back in June and tells Anderson Cooper how her family is reacting to the trial and the news of the proposed swap.

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