Mueller is investigating ties between the Trump campaign and Republican activist Peter W. Smith, who stated that he tried to obtain Hillary Clinton's emails from Russian hackers, and that he was acting on behalf of Michael Flynn and other senior Trump campaign members. Trump campaign officials have denied that Smith was working with them. In fall 2017, Mueller's team interviewed former Government Communications Headquarters cybersecurity researcher Matt Tait, who had been approached by Smith to verify the authenticity of emails allegedly hacked from Clinton's private email server. Tait reportedly told House Intelligence Committee investigators in October 2017 that he believed Smith had ties to members of Trump's inner circle—including Flynn, Steve Bannon, and Kellyanne Conway—and may have been helping build opposition research for the Trump campaign. Smith committed suicide in May 2017, several days after talking to The Wall Street Journal about his alleged efforts. Aged 81 and reportedly in failing health, he left a carefully prepared file of documents, including a statement police called a suicide note. An attorney for Smith's estate said in October 2017 that some of Smith's documents had been turned over to the Senate Intelligence Committee. The Wall Street Journal reported on October 7, 2018, that Smith had raised at least $100,000 from donors in his pursuit of the Clinton emails, that his estate had provided documents to the Mueller investigation, and that associates of Smith had been questioned by Mueller's investigators or a grand jury. The Wall Street Journal reported on October 10, 2018, that Smith had established a "professional relationship" with Flynn as early as 2015, and during the campaign was using Flynn's contacts to assist with his search for the Clinton emails. The Journal reported on October 19, 2018, that the Mueller investigation has evidence Smith may have had prior knowledge of the Guccifer 2.0 hacks. The Mueller report later confirmed significant aspects of Smith's efforts to locate the Clinton emails, including his communications about it with Flynn and campaign co-chair Sam Clovis, as well as Flynn's actions to spearhead the effort at Trump's repeated requests. In May 2019, an unredacted version of a December 2018 government sentencing memo for Flynn showed he had advised investigators that members of the Trump campaign had discussed whether to contact WikiLeaks about the release of emails.
The investigation was officially concluded on March 22, 2019, with the Mueller Report submitted to Attorney General William Barr. Barr had been critical of the investigation before he became Attorney General. A redacted version of the report was released to the public on April 18, 2019. The report concluded that the Internet Research Agency's social media campaign supported Trump's presidential candidacy while attacking Clinton's, and Russian intelligence hacked and released damaging material from the Clinton campaign and various Democratic Party organizations. The investigation "identified numerous links between the Russian government and the Trump campaign", and determined that the Trump campaign "expected it would benefit electorally" from Russian hacking efforts. However, ultimately "the investigation did not establish that members of the Trump campaign conspired or coordinated with the Russian government in its election interference activities". The evidence was not necessarily complete due to encrypted, deleted, or unsaved communications as well as false, incomplete, or declined testimony. Mueller later said that the investigation's conclusion on Russian interference "deserves the attention of every American".
More InfoReuters reported on March 29, 2018, that the special counsel is examining an event at the 2016 Republican National Convention at which Jeff Sessions had conversations with Russian ambassador Sergei Kislyak. Investigators are also looking into how and why language deemed hostile to Russia was removed from the Republican party's platform document during the convention. Mueller's office is also inquiring whether Sessions had private conversations with Kislyak at a Trump speech at the Mayflower Hotel in April 2016.
More InfoOn January 16, 2018, The New York Times reported that Steve Bannon was subpoenaed by Mueller to testify before the standing grand jury in Washington, DC. Reuters and CNN reported the next day that Bannon had struck a deal with Mueller's team to be interviewed by prosecutors instead of testifying before the grand jury. On February 15, 2018, multiple sources reported that those interviews had taken place over several days that week. TMZ reported that Kristin M. Davis, the "Manhattan Madam" who had previously worked for Roger Stone, was subpoenaed in June 2018. On August 10, 2018, a federal judge found Stone's former aide Andrew Miller to be in contempt of court for refusing to testify before the grand jury. Also that day, the Mueller investigation subpoenaed Randy Credico, whom Stone had described as his "backchannel" to Julian Assange. The Wall Street Journal reported on November 14, 2018, that Mueller's investigators are examining whether Stone engaged in witness tampering by intimidating Credico into supporting Stone's assertions.
More InfoAs the Mueller investigation progressed, Trump repeatedly expressed anger over Attorney General Sessions' decision to recuse. In July 2017, Trump said that Sessions should have informed him about Sessions' impending recusal before Trump even nominated him, then Trump would have nominated someone else for Attorney General. In May 2018, Trump said that he wished that he had nominated someone other than Sessions for Attorney General. In August 2018, Trump declared that Sessions' job was safe at least until the November 2018 United States midterm elections. Sessions resigned as Attorney General on November 7, 2018, the day after the midterm elections, writing that he had resigned at Trump's request.
More InfoThe New York Times reported, on March 28, 2018, that former Trump campaign deputy chairman Rick Gates had, in September and October 2016, frequently communicated with a man that the FBI believes is a former agent of GRU, Russia's largest foreign intelligence agency, and who had maintained active links with Russian intelligence during these communications; this disclosure was written into a court sentencing document for Alex van der Zwaan, submitted by Robert Mueller. Identified in the document as "Person A", The Times reported that the man matched the description of Konstantin Kilimnik, who, for years, was Paul Manafort's "right-hand man" in Ukraine. Gates reportedly told an associate that he knew "Person A" was a former GRU agent, although Manafort told associates he was not aware of such a connection. The Times reported on January 8, 2019, that in spring 2016 Gates and Manafort gave polling data, some of which was private to the Trump campaign, to Kilimnik, asking he pass it to Ukrainians Serhiy Lyovochkin and Rinat Akhmetov. During a closed-door court hearing on February 4, 2019, regarding false statements Manafort had made to investigators about his communications with Kilimnik, special counsel prosecutor Andrew Weissmann told judge Amy Berman Jackson that "This goes, I think, very much to the heart of what the special counsel's office is investigating," suggesting that Mueller's office continued to examine a possible agreement between Russia and the Trump campaign.
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