FILE - This Aug. 12, 2008, file photo shows United States' relay swimmer Klete Keller at the Beijing 2008 Olympics. The five-time Olympic medalist pleaded guilty on Wednesday, Sept. 29, 2021, to a felony charge for storming the U.S. Capitol during the Jan. 6 riot. Keller faces 21 to 27 months in prison for his guilty plea to obstruction of an official proceeding. (AP Photo/Thomas Kienzle, File)

FILE - In this Jan. 6, 2021 file photo, violent insurrectionists loyal to President Donald Trump scale the west wall of the the U.S. Capitol in Washington. In the nearly nine months since Jan. 6, federal agents have managed to track down and arrest more than 600 people across the U.S. believed to have joined in the riot at the Capitol. Getting those cases swiftly to trial is turning out to be an even more difficult task. (AP Photo/Jose Luis Magana, File)