The Federal Bureau of Investigation has reviewed intercepted calls between retired Army Lt. Gen. Michael Flynn and the Russian ambassador to the United States, and has found no evidence of wrongdoing.

The Washington Post reported Tuesday that the FBI reviewed communications between Flynn and ambassador Sergey Kislyak on Dec. 29, the day President Obama announced more sanctions against Russia for their influence campaign on the presidential election.

The U.S. was conducting routine electronic surveillance on Kislyak and picked up the conversations with Flynn, which President Trump's team has both confirmed and denied happened.

White House press secretary Sean Spicer said Monday Kislyak and Flynn never spoke on Dec. 29, and only spoke on Dec. 28, but the Trump camp confirmed this month the two did speak on Dec. 29.

The Post reported Flynn did not commit any wrongdoing and there is no evidence of illicit ties between him and the Russian government.

The White House maintains Flynn and Kislyak had friendly conversation and the only business talk was about setting up a call between Trump and Russian President Vladimir Putin. The sanctions were never discussed, Spicer said.