Special Counsel Robert Mueller was appointed in May 2017 to head the investigation into Russia's meddling in the 2016 election. Here are some key developments in the investigation.
Oct. 31, 2017: Trump tweets that Papadopoulos is a "liar" and was a "low-level volunteer" on the Trump campaign.
Oct. 30, 2017: Former Trump campaign foreign policy adviser George Papadopoulos has pleaded guilty to making a false statement to the FBI after lying about his interactions with foreign officials close to the Russian government.
Oct. 30, 2017: Former Trump campaign chairman Paul Manafort is turning himself in Monday to Justice Department special counsel Robert Mueller, reported CNN.
Oct. 27, 2017: A federal grand jury in Washington approved the first charges in the investigation led by special counsel Robert Mueller. Plans were prepared for anyone charged to be taken into custody as soon as Monday, Oct. 30.
Sept. 27, 2017: The IRS is now sharing information with special counsel Robert Mueller about key Trump campaign officials, after the two entities clashed this summer over both the scope of the investigation into Russia's meddling in the 2016 election and a raid on former Trump campaign chairman Paul Manafort's home, people briefed on the matter said.