Republican National Committee Chairwoman Ronna McDaniel warned Republican lawmakers Thursday that if they don't start following through on their campaign promises, they will lose voters in 2018.

"I have to bring the grassroots to Washington and tell our legislators, if we don't do the things that we campaigned on, we will see our voters turn their back on us in 2018," McDaniel said in an interview on Fox News.

McDaniel specifically pointed to repeated promises to repeal and replace the Affordable Care Act and reform the tax code as action congressional Republicans said they would take while on the campaign trail, but have yet to accomplish.

House Republicans passed a bill last month repealing and replacing Obamacare, but the Senate is in the process of working on their own legislation.

While McDaniel put the onus to follow through on campaign promises squarely on congressional Republicans, she said voters are pleased with President Trump.

"He's enacted deregulation, he's restored America's standing as a leader in the world, but they need to see Congress act and do the things we campaigned on," she said.