Questions of political interference have dogged the investigation before.
McCabe said at the hearing that the bureau has adequate resources to carry out the investigation.
On Wednesday, Huckabee insisted that President Trump dismissed Comey on the recommendations of both Attorney General Jeff Sessions and his new deputy, Rod Rosenstein. But what are special prosecutors, and why are they so special ... and feared? [Rosenstein] made a recommendation. But Senate Majority Leader Mitch McConnell, with the support of the White House, brushed aside those calls, saying a new investigation would only "impede the current work being done".
Even if a special counsel is appointed, it would be hard to dispel a perception of impropriety.
Two former senior Justice Department officials said it made little sense to fire Comey while the Justice Department Inspector General was still doing a review of the FBI's handling of the Clinton email investigation.
Mr Trump is only the second president to fire an Federal Bureau of Investigation director, underscoring the highly unusual nature of his decision. Such a statement from Comey would not appear to follow the FBI's protocol, multiple reports said. And I said, 'I'll consider. On Monday, the President met with the Attorney General and the Deputy Attorney General and they discussed reasons for removing the Director.
But it wasn't always this way. But Congress let the law expire in 1999.
Comey had originally been scheduled to testify Thursday, which - until the director's bombshell ouster - was intended as a hearing to update lawmakers about pressing national-security threats.
"On Tuesday, the President's letter said that Director Comey told him he was not under investigation". McCabe added that Comey's firing did not force a curtailment of the probe and said the agency has adequate resources to pursue it.
Sanders first made this point when she appeared on Fox News on Tuesday night after news of Comey's termination broke to insist that "it's time to move on" from Russian Federation. "My decision", Trump also said. And now is certainly an appropriate time for one.
"I strongly believe the Russian Federation investigation is adequately resourced", McCabe told the lawmakers. The Senate must not roll over for the president on this confirmation.
The governor also said "I am finishing my term" when asked if he would as agree to replace Comey if Trump nominated him. But most Democrats and some Republicans - including the chairman of the Senate Intelligence Committee, which is conducting a similar probe - remain skeptical of Trump's reasoning and timing. "We are going to do that".
Trump told NBC News on Thursday that Comey is "a showboat, he's a grandstander".