Republicans shot back at Sen. Harry Reid (D-Nev.) on Monday, calling on the majority leader to return donations from Goldman Sachs, or explain why he wouldn't.

The National Republican Senatorial Committee (NRSC) sought to tie Reid to Wall Street giant Goldman Sachs, which was hit with civil charges by the Securities and Exchange Commission (SEC) on Friday alleging that it'd committed fraud with one of its mortgage securities instruments.

Reid's office demanded that Senate Minority Leader Mitch McConnell (R-Ky.) and NRSC Chairman John Cornyn (Texas) to explain the content of their meetings with financial executives on Monday, but the NRSC demanded an explanation of its own.

“If Harry Reid believes there’s something wrong with meeting with business executives in New York City, then he should immediately explain to his Nevada constituents why he was scooping up campaign cash from Goldman Sachs just a few days ago at a backroom Manhattan fundraiser," NRSC communications director Brian Walsh said Monday.

"One can only presume that Senator Reid will be returning these donations immediately along with the more than $1.1 million he’s taken from Wall Street over the years," Walsh added. "And if not, he should explain why not."

Reid has received $4,900 in donations from Goldman, according to OpenSecrets, though it's not clear whether a corporate PAC or individuals were responsible for that amount.

Reid is facing a tough reelection battle in his home state of Nevada, where the NRSC has been hammering away at the majority leader for his work in Washington.

"The embattled Democrat Leader too often forgets that what matters to his friends at home in the Ritz Carlton in Washington means little to voters back in Nevada who are facing record foreclosure and unemployment rates," Walsh said.