The House Judiciary and Intelligence committees subpoenaed Mueller on June 25, 2019, with a letter saying that "the American public deserves to hear directly from you about your investigation and conclusions." Mueller reluctantly agreed to testify publicly with a scheduled date of July 17. This date was later pushed back to July 24. During his testimony, Mueller answered Republican Representative Ken Buck that a president could be charged with obstruction of justice (or other crimes) after the president left office.
Glenn R. Simpson, a co-founder of Fusion GPS, testified to the Senate Judiciary Committee on August 22, 2017, that the FBI told Christopher Steele—and then Steele told Simpson—that the FBI had "a human source from inside the Trump organization" (and, more specifically, "an internal Trump campaign source"). Simpson did not indicate when Steele received this information or when he conveyed it to Simpson. The Washington Post reported on May 8, 2018, that a longtime FBI and CIA informant had provided information about connections between Russia and the Trump campaign to FBI investigators early in their investigation. This sparked speculation that the FBI had planted a "mole" inside the Trump campaign, although it was not clear that the individual Simpson described was the same individual described by The Post. The Washington Post reported on May 9, 2018, that House Intelligence Committee Chairman Devin Nunes subpoenaed the Justice Department to provide him with all documents regarding the longtime informant; The Post quoted the subpoena as demanding "all documents referring or related to the individual referenced in Chairman Nunes' April 24, 2018, classified letter to Attorney General Sessions", although Nunes denied he had referred to any specific individual. The Justice Department resisted on the grounds that revealing the information could endanger the life of a longtime top-secret informant for the FBI and CIA, and the Trump White House—with the president's agreement—sided with the Justice Department. The New York Times reported on May 16, 2018, that at least one government informant had met several times with Trump campaign aides Carter Page and George Papadopoulos.
More InfoThe Wall Street Journal reported on December 15, 2017, that Mueller's office had requested and received employee emails from Cambridge Analytica, a data analytics firm that worked for the Trump campaign, earlier that year. The Washington Post reported on March 20, 2018, that Christopher Wylie, an employee of Cambridge Analytica until late 2014, said that former Trump campaign CEO and White House Chief Strategist Steve Bannon oversaw a 2014 effort at the company (which he co-founded) to gather Facebook data on millions of Americans and test the effectiveness of anti-establishment messages such as "drain the swamp" and "deep state", which became major Trump themes after Bannon joined the campaign in August 2016. Views of Russian President Vladimir Putin were also tested. The Associated Press reported on March 22, 2018, that the special counsel is examining the connections between the company, the Trump campaign and the Republican National Committee, particularly how voter data may have been used in battleground states.
More InfoOn January 25, 2019, Roger Stone, a long time advisor to Donald Trump, was arrested by the FBI at a pre-dawn raid in Florida. The indictment filed by the Office of the Special Counsel contained 7 charges, including obstruction of an official proceeding, witness tampering, and lying to congress in regard to the investigation into Russian interference in the 2016 US election and his involvement with WikiLeaks. In the charging document, prosecutors alleged that, after the first Wikileaks release of hacked DNC emails in July 2016, "a senior Trump Campaign official was directed to contact Stone about any additional releases and what other damaging information [WikiLeaks] had regarding the Clinton Campaign. Stone thereafter told the Trump Campaign about potential future releases of damaging material by [WikiLeaks]." The indictment also alleged that Stone had discussed Wikileaks releases with multiple senior Trump campaign officials. By the time of those contacts, it had been publicly reported that the DNC emails had been hacked by Russians and provided to Wikileaks. Stone was convicted of all charges in November 2019, after the conclusion of the investigation.
More InfoThe Washington Post reported on March 6, 2018, that Mueller's office had requested documents and interviewed witnesses regarding activities of Michael Cohen, Trump's longtime personal lawyer. Investigators are reported to be interested in at least two episodes relating to Russian interests, including the proposed construction of Trump Tower Moscow and "a Russia-friendly peace proposal for Ukraine that was delivered to Cohen by an Ukrainian lawmaker one week after Trump took office". The New York Times reported, on January 10, 2019, that Mueller investigators, and other federal prosecutors, were investigating the activities of over a dozen Russia-aligned Ukrainian political and business figures who attended the Trump inauguration, ostensibly promoting a pro-Russian "peace plan" for Ukraine that included the lifting of sanctions against Russia. Andrey Artemenko, a Ukrainian politician who attended the Trump inaugural, was interviewed by the FBI and the Mueller grand jury, having met, days after the inaugural, with Trump attorney Michael Cohen and former Trump business associate Felix Sater, in New York, to present a proposal. Cohen hand-delivered Artemenko's proposal to Michael Flynn one week before Flynn resigned as national security advisor.
More InfoThe Washington Post reported on June 28, 2018, that the Mueller investigation, as well as British investigators, were examining relationships between the Brexit movement, Russia and the Trump campaign. The Post reported that Mueller's investigators had specifically asked two individuals, including former Trump communications official Michael Caputo, about relationships between Trump associates and Brexit leader Nigel Farage. Ted Malloch, who had worked with the Trump campaign and was later questioned by Mueller investigators, was reportedly close to Farage.
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