Current White House staffer caught up in Russia probe, source says

Officials would not identify the staffer.

The Washington Post was the first to report on this detail of the investigation, saying a "senior White House adviser" has become "a significant person of interest" in the probe.

Officials speaking to ABC News would not identify the staffer, and it is unclear exactly why authorities are interested in this individual.

Multiple Congressional committees are also investigating potential ties between the President’s campaign and the Russians.

"As the President has stated before - a thorough investigation will confirm that there was no collusion between the campaign and any foreign entity," said Spicer.