WHAT'S THIS ALL ABOUT?
WHAT DO I NEED TO KNOW RIGHT NOW?
So far, Mueller has charged 34 people, including several close to the president. But he has yet to accuse anyone close to the Trump campaign of conspiring with the Kremlin to hurt Democrat Hillary Clinton and help Trump win the election.
On Monday, a federal judge set a March 13 sentencing for former Trump campaign chairman Paul Manafort on two felony charges stemming from witness tampering and crimes related to his Ukrainian political work.
Roger Stone, a longtime Trump adviser and confidant, was the latest in Trump's circle to face charges. The political operative is accused of lying to lawmakers, engaging in witness tampering and obstructing a congressional investigation into possible coordination between Russia and Trump's campaign. He pleaded not guilty last week.
In a separate case, federal prosecutors in New York issued a subpoena Monday seeking documents from Trump's inaugural committee, furthering a federal inquiry into a fund that has faced mounting scrutiny into how it raised and spent its money.
SO ... DID THE TRUMP CAMPAIGN COLLUDE WITH RUSSIA?
There is no smoking gun when it comes to the question of Russia collusion. But the evidence so far shows that a broad range of Trump associates had Russia-related contacts during the 2016 presidential campaign and transition period, and several lied about the communication.
There is also evidence that some people in the president's orbit were discussing a possible email dump from WikiLeaks before it occurred. American intelligence agencies and Mueller have said Russia was the source of hacked material released by WikiLeaks during the campaign that was damaging to Hillary Clinton's presidential effort.
OTHER QUESTIONS TO CONSIDER:
—WHAT ABOUT OBSTRUCTION OF JUSTICE? That is another unresolved question that Mueller is pursuing. Investigators have examined key episodes such as Trump's firing of FBI Director James Comey and his fury over the recusal from the investigation by then-Attorney General Jeff Sessions.
—WHAT DOES TRUMP HAVE TO SAY ABOUT ALL THIS? Trump has repeatedly slammed the Mueller investigation as a "witch hunt" and insisted there was "NO COLLUSION" with Russia. He also says his former lawyer, Cohen, lied to get a lighter sentence in New York.
—WHEN WILL IT ALL WRAP UP? It's unclear. Acting Attorney General Matthew Whitaker says the probe is "close to being completed" — the first official sign that Mueller's investigation may be wrapping up. But he gave no specific timetable.
For more in-depth information, follow AP coverage at https://apnews.com/TrumpInvestigations