The chairman of the House Intelligence Committee said Sunday he believes "more whistleblowers" will come forward with information on the deadly attack last year on diplomatic outpost in Benghazi, Libya.

"I do think we are going to see more whistleblowers. I know certainly my committee has been contacted, I think other committees [have been contacted] as well," Rep. Mike Rogers (R-Mich.) said on "Fox News Sunday."

Rogers's comments came days after a trio of State Department officials criticized the Obama administration's actions regarding the Sept. 11, 2012 attacks at a House Oversight and Government Reform Committee hearing.

"I will tell you, we have had people come forward because of the testimony and say, we would also like to talk, we feel a little bit intimidated by this, but have information we think is valuable," Rogers said.

Rogers also charged that the administration "changed the narrative" on Benghazi. New details surfaced Friday about e-mails that illustrated a clash between the State Department and the Central Intelligence Agency over talking points in the aftermath of the assault in which four Americans, including Ambassador J. Christopher Stevens, were killed.

"We know that there was at least the general consensus at the time going into the 16th [of September] that was yes, it was a terrorist attack, but they changed the narrative. And I think that's what the investigation needs to focus on -- why did they change the narrative, did it have a consequence," Rogers said.

White House Press Secretary Jay Carney said last November the only change the White House and State Department made to the talking points was substituting in “diplomatic facility” for "consulate" in the final version.

The top Democrat on the House Armed Services Committee, Rep. Adam Smith (D-Wash.), defended the administration, saying it didn't mislead anyone. Smith called for lawmakers to direct their focus to the groups responsible for the attacks instead of focusing on talking points.

"Clearly there were more changes made than [Carney's] statement made. ... I would much rather get into an investigation of the groups that threaten the U.S," Smith said.

The Democrat also charged Republicans with playing politics.  "This has just become a very, very partisan-focused, scandal-focused attack by the Republicans investigating this instead of trying to figure out what happened," said Smith, echoing what Carney said on Friday.

"I doubt anyone can say we've been partisan or political in this," countered Rogers.