“The FBI criminal investigation originated from a referral sent by Kurt Olsen, Presidentially appointed Director of Election Security and Integrity,” the affidavit said. Mr. Olsen played a central role in Mr. Trump’s attempt to overturn the 2020 election, including speaking to the president multiple times on Jan. 6, 2021. He has continued to push false claims about elections, and was recently appointed to a key role in the Trump administration.