Paul Manafort volunteers to testify in Russia probe as committee cancels other testimony

Manafort was not a subject of the "incidentally collected" information.

Nunes told the press in his announcement Friday that it is up to Manafort to decide whether or not his testimony will be in an open hearing. A Senate source tells ABC News that the Senate Intelligence Committee will also meet with Manafort as part of its similar investigation.

"As Mr. Manafort has always maintained, he looks forward to meeting with those conducting serious investigations of these issues to discuss the facts," the spokesperson said.

Nunes also clarified that Manafort is not one of the individuals caught up in incidental surveillance of the Trump transition team. Earlier this week Nunes drew skepticism when he revealed to the press and the White House that he had new information from secret sources suggesting the Obama administration had collected surveillance on members of the Trump transition team and possibly Trump himself in the course of the investigation of Russia.

Democrats have asserted that no matter what NSA documents the committee receives, the president's claims that his predecessor wiretapped him during the campaign will never be vindicated. Many have called into question Nunes' ability to conduct a fair investigation of the Russia matter.

In anticipation of that closed meeting, a previously planned March 28 hearing is now postponed, Nunes also announced.

The ranking Democratic member on the Intelligence Committee, Adam Schiff, D-Calif., tweeted that Chairman Nunes cancelled the hearing in an "attempt to choke off public info."