George Papadopoulos, the first to plead guilty in Robert Mueller's probe, gets 14 days in prison, well under the six-month sentence sought by the government.
Donald Trump says special counsel Robert Mueller should have wrapped up the inquiry long ago.
During his second day of confirmation hearings, the Supreme Court nominee also refuses to say whether he thinks a president can pardon himself.
Prosecutors say the Trump campaign's former foreign policy adviser caused irreparable damage to the Russia probe by lying repeatedly during a January 2017 interview.
The longtime agent, removed from the special counsel's Trump-Russia investigation when the messages were discovered, had defended himself in a combative House hearing. His lawyer says the firing was due to political pressure.
Taking to Twitter to complain about the ongoing Russia investigation, the president says the attorney general "should stop this Rigged Witch Hunt right now, before it continues to stain our country any further."
The president takes a harsh shot at a congresswoman's intellect and Democrats worry that some of their own anti-Trump rhetoric might backfire in November.
The Justice Department's inspector general says that although the former FBI director broke with protocol in his handling of the Hillary Clinton email investigation, James Comey's decisions were not politically driven.