Peter Strzok, a former FBI investigator, has stepped down from the investigation being led by Special Counsel Robert Mueller. The investigation into supposed Russian influence in the 2016 presidential campaign season has hit a new stride in recent weeks, following news in early August that Mueller had impaneled a grand jury in the probe.
It was later learned that the FBI raided the home of former Trump campaign chief Paul Manafort.
Others associated with President Trump, such as former communications consultant Michael Caputo -- who has testified before the House Intelligence Committee-- have said that the FBI has not contacted them.
Strzok once was the head of FBI counter-espionage office. He also investigated Hillary Clinton's email server controversy. He also investigated the claims made by the Democratic National Convention that its email system had been hacked by unknown Russian hackers. That narrative has been recently come in for doubt on the part of establishment media, such as the liberal magazine The Nation.
President Trump has proclaimed that the narrative about Russian interference and hacking is an excuse broadcast by Democrats to explain Hillary Clinton's loss in November.