Sen. Jerry Moran (R- Kan.) (AP Photo/Evan Vucci)

National Republican Senatorial Committee Chairman Jerry Moran (Kan.) predicted Thursday that talk about impeachment and suing President Obama will not have a negative impact on Republicans in the battle for the U.S. Senate.

Echoing comments made by House GOP leaders earlier in the week, Moran said Democrats have driven impeachment chatter to boost fundraising. He called it a "fake threat."

"I don't see that this topic of conversation becomes something that's any real threat and therefore I can't imagine that it can become any significant challenge for us," said Moran.

Moran said he knows of "no Republicans that are talking about impeachment. People who are talking about impeachment are the Democrats."

The House on Wednesday voted along party lines to move ahead with plans to sue President Obama for using executive powers to alter the federal health-care law. Moran brushed off questions about the lawsuit, saying House leaders are the ones who should be asked about their decisions.

Obama slammed House Republicans on Wednesday for trying to sue him. House Democrats' campaign arm has been trumpeting its record-setting online fundraising pace since talk of the lawsuit first surfaced about a month ago.

Democrats have also raised money off impeachment calls. While the GOP establishment does not want to impeach Obama, some conservatives like Sarah Palin are advocating it.

Republicans need to gain six seats to win back the Senate majority. Moran expressed confidence about Republican chances in Montana, South Dakota and West Virginia, conservative states where Democratic senators are retiring. He also mentioned Louisiana, Arkansas, North Carolina and Alaska, all states Mitt Romney won where Democratic incumbents are running for reelection.

"We have significant opportunities. History is on our side," said Moran.

Republicans are defending seats in Kentucky and Georgia, where Democrats have recruited capable candidates. Moran said he feels good about Senate Minority Leader Mitch McConnell's chances in the Kentucky. He said the NRSC has not donated money to McConnell at the leader's request.

"What is going to transpire in Kentucky is is going to be determined by Sen. McConnell and his campaign team," said Moran.