An FBI complaint, citing screenshots from the video, asked that a warrant be issued charging Keller with knowingly entering a restricted building without lawful authority and attempting to impede an official government function.
Thousands of supporters of President Donald Trump stormed the Capitol during a joint session of Congress on Jan. 6 while lawmakers met to formalize the victory of President-elect Joe Biden.
The 38-year-old Keller competed in the 2000, 2004 and 2008 Summer Olympics. He captured two golds and a silver as a member of the 4×200-meter freestyle relay, as well as a pair of individual bronzes in the 400 free.
Messages seeing comment left with Keller and his sister, former Olympic swimmer Kalyn Keller, were not immediately returned.