Congress is hearing from more whistleblowers who wish to testify on the terrorist attack in Benghazi, according to House Intelligence Committee Chairman Mike Rogers (R-Mich.).

Rogers told "Fox News Sunday" that following the testimony of three whistleblowers before the House Oversight Committee, lawmakers have been contacted by other potential witnesses.

"We have had people come forward because of the [Oversight] testimony and say we would also like to talk," he said. "I do think we're going to see more whistleblowers. Certainly my committee has been contacted, I think other committees as well."

On Wednesday, three current and former State Department employees testified before the panel, saying they knew almost immediately the Sept. 2012 attack on the U.S. Consulate was terrorism, even as the administration was slow to describe the attack as organized, instead initially blaming it on a spontaneous mob.

Rogers said the focus of the investigation going forward should be on why the White House presented a different narrative initially.

"Some of the early indications are that they didn't want the narrative that it was a terrorist attack on their watch," he said. "Clearly that's what it appears to be."

But Rep. Adam SmithDavid (Adam) Adam SmithAmerica cannot afford to be left behind on global development Congress, fight global poverty by modernizing our private-sector tools Overnight Cybersecurity: Trump unveils new sanctions on Russia | Feds say Russian hackers targeted US energy grid | NSA nominee sails through second confirmation hearing MORE (D-Wash.), the ranking member of the House Armed Services Committee, contended the investigation has taken on a decidedly partisan tone which has "undermined" the process.

"This has just become a very, very partisan focused, scandal-focused attack by the Republicans investigating it," he said. "The desire of the Republicans to create a scandal here has really undermined the ability to have a credible look at what happened here."

Smith added that the GOP focus on the extent to which the White House altered initial talking points after the attack to downplay any terrorist element should be secondary to determining who was behind the attacks.

"We're talking about talking points. There's no question this was a terrorist attack, they didn't deny it," he said.

ABC News reported Friday that draft talking points showed the State Department and White House had edited the talking points 12 different times, after the administration initially said it made just a single edit to those points.

Rogers admitted that some outside Republican groups are using the issue to build attack ads against former Secretary of State Hillary ClintonHillary Diane Rodham ClintonKoch-backed group launches six-figure ad buy against Heitkamp Trump keeps up 'low IQ' attack on Maxine Waters GOP leaders to Trump: Leave Mueller alone MORE, seen as a Democratic frontrunner for the 2016 nomination, but insisted that any work by his committee has been free of partisan attacks.

"People are going to take advantage of every situation and make it political," he said. "I doubt anyone can say we've been partisan or political in this. I do believe you need to have a fact-based investigation, and I believe that's what we're doing."