The special counsel investigation has resulted in criminal counts against more than 30 people and three Russian entities. And while the final outcome of the Mueller probe remains far from certain, it has already generated new insights into how Russia targeted the election, the presidential transition and Trump's business empire.

If the saga of Michael Flynn feels like it's been hanging over President Trump's head since inauguration day, that's because it has.

The special counsel investigating Russian interference in the 2016 presidential election has charged retired lieutenant general and former national security adviser Michael Flynn with making false statements to the FBI, according to a criminal information filed by the special counsel. Flynn is expected in federal court in Washington, D.C., on Friday morning when he is expected to plead guilty to a single charge of making statements.

National security adviser Michael Flynn has resigned after reports he misled Trump administration officials about his contacts with Russia's ambassador to the U.S. Flynn's departure less than one month into the Trump administration marks an extraordinarily early shakeup in the president's senior team of advisers.