The key themes, dates and players in the investigation related to the role Russia may have played in the 2016 campaign.
• Russia carried out a campaign to influence the outcome of the 2016 U.S. presidential election, denigrating Hillary Clinton and boosting Donald Trump, according to U.S. intelligence agencies. President Vladimir Putin of Russia personally ordered it.
• The FBI, citing four Trump campaign aides’ ties to Russia, opened a counterintelligence investigation in the summer of 2016 to determine whether Trump associates aided Russia’s election interference.
• Robert Mueller, the former FBI director, was appointed the special counsel in May 2017 to take over the investigation. The inquiry has expanded to examine whether President Donald Trump tried to obstruct the investigation itself.
• Nineteen people — including four Trump associates — and three companies have been indicted in the case. Five have pleaded guilty; 13 are Russians accused of meddling in the election.
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Mueller is investigating Russia’s efforts to influence the presidential race and sow discord by spreading inflammatory messages on social media and stealing emails from Clinton’s campaign chairman and the Democratic National Committee, which were then strategically released to undermine the Clinton campaign.
Investigators are examining what Trump’s aides and associates knew about Russia’s meddling, particularly the release of thousands of stolen Democratic emails stolen, and whether any of them aided Moscow’s effort.
Mueller is investigating an array of the president’s actions — including the firing of former FBI Director James Comey — to determine whether Trump sought to impede the investigation into Russia’s actions.
Mueller is investigating whether Trump associates ran afoul of U.S. lobbying or anti-corruption laws. Two aides to the Trump campaign, including its onetime chairman, were charged with financial crimes related to their work as advisers to a pro-Russia former president of Ukraine.
Russia’s annexation of Crimea in March 2014 prompted international ire, and the United States responded by imposing sanctions and taking other steps designed to isolate Moscow on the world stage.
Out to restore its own influence, Russia sought to undermine the United States, taking aim at its vulnerabilities — namely domestic political polarization. As early as April 2014, a friend of President Vladimir Putin began an operation that included setting up a troll farm to create fake social media posts and sending operatives to the United States to gather intelligence on the political process. The stated goal: “spread distrust towards the candidates and the political system in general.”
U.S. officials have traced other elements of Russia’s interference, notably the hacking and leaking of Democratic emails, to Russian intelligence agencies carrying out Putin’s orders.
June 16, 2015
Donald Trump announced his campaign for president.
March 31, 2016
As he closed in on a stunning victory in the Republican primary, Trump met in Washington with his foreign policy advisers. One, George Papadopoulos, told the group that he had connections to help arrange a meeting between Trump and Putin. Others at the meeting noted that Russia was under sanctions. Jeff Sessions, then a senator from Alabama and a top Trump campaign adviser, quickly shut down the subject and said it should not be discussed again, a former campaign official has said. That conversation fits into the purview of Mueller’s investigation.
April 26, 2016
A London-based professor with ties to the Russian government informed Papadopoulos that the Russians had thousands of emails that would embarrass Clinton.
June 9, 2016
Donald Trump Jr. and top campaign officials met with Natalia Veselnitskaya, a Russian lawyer, at Trump Tower to discuss what an intermediary promised to be incriminating information about Clinton. Paul Manafort, the campaign chairman, and Jared Kushner, Donald Trump’s son-in-law, were among those also at the meeting, where Veselnitskaya complained about U.S. sanctions on Russia. The special counsel is investigating.
June 14, 2016
Crowdstrike, a cybersecurity firm hired by the Democratic National Committee, announced that it had expelled two Russian hacker groups — called Cozy Bear and Fancy Bear — that had penetrated the DNC’s systems. The groups had gained access to thousands of emails and confidential documents. Just over a month later, WikiLeaks released nearly 20,000 hacked Democratic emails.
July 31, 2016
In light of existing ties between four campaign aides and Moscow, the FBI opened its investigation into the Trump campaign’s links to Russia.
Nov. 8, 2016
Trump won the presidential election, defeating Hillary Clinton in an extraordinary upset.
Dec. 29, 2016
Then-President Barack Obama announced sanctions against Russia, citing its attempts to interfere with the presidential election. That day, Michael T. Flynn, in line to be Trump’s national security adviser, discussed the sanctions with the Russian ambassador to the United States. He later pleaded guilty to lying to investigators about the conversations, which undermined existing U.S. policy and flouted a warning from a senior Obama administration official to stop meddling in foreign affairs before the inauguration.
Jan. 20, 2017
Trump was inaugurated as the 45th president of the United States.
Feb. 13, 2017
Flynn resigned as national security adviser following revelations that he had misled Vice President Mike Pence and other top officials about his conversations in December with the Russian ambassador. The FBI had also asked him about those calls.
Feb. 14, 2017
In the Oval Office, Trump privately asked Comey, the FBI director, to shut down the investigation into Flynn.
“I hope you can see your way clear to letting this go, to letting Flynn go,” Trump said, according to a memo Comey wrote. “He is a good guy. I hope you can let this go.” Mueller is investigating the episode as he examines whether the president tried to obstruct the inquiry itself.
March 2, 2017
Citing his role as a top Trump campaign adviser and under scrutiny over meetings he had with Russians, Sessions, now the attorney general, recused himself from all campaign-related matters at the Justice Department, including the Russia investigation. Rod J. Rosenstein, the deputy attorney general, later became the top Justice Department official overseeing the Russia inquiry.
May 9, 2017
Trump fired Comeyas the FBI director. Initially, he cited his handling of the investigation into Hillary Clinton’s emails, but later gave varying rationales, saying at one point that the Russia allegations were a “made-up story.”
One day later, Trump told Russian officials whom he was hosting in the Oval Office that firing Comey had relieved “great pressure” on him.
“I just fired the head of the FBI. He was crazy, a real nut job,” Trump said. “I faced great pressure because of Russia. That’s taken off.” Comey’s firing is also a subject of Mueller’s obstruction inquiry.
May 17, 2017
Rosenstein appointed Mueller, the former FBI director, to serve as special counsel and oversee the investigation.
Oct. 3, 2017
Papadopoulos was charged with lying to the FBI and signed a plea deal two days later. He began cooperating with the investigation.
Oct. 30, 2017
Manafort and Rick Gates, his business associate and the deputy campaign chairman, surrendered to the authorities and pleaded not guilty to charges including money laundering and tax fraud.
Dec 1. 2017
Flynn pleaded guilty to lying to investigators and said he had agreed to cooperate with the special counsel.
Feb. 16, 2018
Thirteen Russians and three companies were charged in a sprawling indictment. Federal prosecutors accused the Russians of stealing the identities of U.S. citizens, posing as political activists and using the flash points of immigration, religion and race to manipulate a campaign in which those issues were already particularly divisive.
Feb. 23, 2018
Gates changed his plea to guilty, admitting that he lied to federal investigators and committed financial fraud, and began cooperating with the special counsel.
April 9, 2018
FBI agents raided the hotel and office of Michael D. Cohen, Trump’s personal lawyer and fixer, based on a referral from the special counsel.
Donald Trump, Republican candidate for president, later 45th president of the United States
Donald Trump Jr., his son
Jared Kushner, his son-in-law
Paul Manafort, his campaign chairman
Jeff Sessions, his campaign adviser, later attorney general
Michael Flynn, his first national security adviser
George Papadopoulos, a campaign adviser on foreign policy
Carter Page, a campaign adviser on foreign policy
Michael D. Cohen, his longtime lawyer and fixer
President Donald Trump’s legal team
Donald F. McGahn II, the White House counsel
Jay Sekulow, Trump’s personal lawyer
Rudy Giuliani, Trump’s personal lawyer
Emmet T. Flood, a White House lawyer who also represented President Bill Clinton during his impeachment
John Dowd, resigned in March 2018 as Trump’s lead lawyer in the inquiry
Ty Cobb, a White House lawyer who is retiring in May 2018
Department of Justice
Rod J. Rosenstein, the deputy attorney general
Robert Mueller, the special counsel and former FBI director
James Comey, the former FBI director