The group had been part of a fundraising committee that includes the Alabama Republican Party and the Republican National Committee. The information was in a filing to the Federal Election Commission on Friday.
The step comes as Senate Republicans, led by Majority Leader Mitch McConnell, have called on Moore to step aside in the Alabama Senate race if the allegations are true.
Sen. Cory Gardner of Colorado is chairman of the NRSC, the campaign arm of the Senate GOP.
Gardner said Thursday when the news broke that Moore should drop out of the race if the allegations were true. The NRSC had previously endorsed Moore in addition to the joint fundraising agreement.
Moore has been defiant, insisting he would not quit the race for the Dec. 12 special election for Attorney General Jeff Sessions' former seat.