Peter Strzok worked for the FBI, he was involved in the 2016 FBI Trump-Russia investigation and was also at the interview held by Comey of Hillary Clinton at her home in 2016 concerning her emails. He, along with another FBI agent were having a affair and they exchanged texts on Trump, one in which Strzok told her Trump wouldn't become president, they would stop it. He, along with Lisa ended up on Mueller's team investigating Trump-Russia collusion. Neither one of them are still currently working for Mueller.