The House Select Committee on Benghazi's investigation has been slowed by behind-the-scenes drama, with Democrats and Republicans at an impasse over which witnesses they would interview in a hearing this morning, Catherine Herridge reported on "America's Newsroom."

The committee held a status hearing today with two witnesses, one from the State Department and one from the CIA.

"Democrats want veto power over witnesses and more say, while Republicans, who are in the majority, are not willing to relinquish more control," Herridge said, adding that some Democrats have even threatened to walk from the committee if the issue is not resolved.

Herridge said that Democrats took the unusual step of releasing documents yesterday that portray Republicans as secretive and downplay allegations that the White House tried to cover up the 2012 terror attack in Benghazi, Libya, that left four Americans dead.

Chairman Rep. Trey Gowdy (R-SC) said in a recent interview that the committee needs broad power to subpoena witnesses, including Ben Rhodes.

Rhodes coached then-UN Ambassador Susan Rice for her five national TV appearances, during which she blamed a video and not terrorists for the attack.

Herridge also reported that the committee has just received more than 15,000 pages of documents that were never released to Congress.

According to The Daily Mail, Gowdy said at the hearing today that the committee recently received the thousands pages of new documents, but needs greater cooperation from the State Department and other agencies to do its job.

"Republicans will see this as more evidence that they need to pursue the Benghazi Select Committee and we'll see what the Democrats have to say in response," Herridge said.

Watch more above.