Texas billionaires John and Laura Arnold are bankrolling a new lobbying effort aimed at leading lawmakers away from the temptation of a tax overhaul that would increase deficits.

Citizens for Responsible Tax Reform launched print advertisements targeting Republicans in 20 states Thursday, including Kentucky, the home of Senate Majority Leader Mitch McConnell and Sen. Rand Paul. The group plans additional television and online ad buys as Congress and the White House debate an overhaul of the nation’s tax code, spokesman Blake Gober said.

The first volley came as senators on Thursday headed into a vote-a-rama on the fiscal 2018 budget resolution, which sets a path for revamping tax laws. The budget, which was adopted Thursday night, includes instructions to the tax-writing committees for a bill that could ultimately add $1.5 trillion to annual deficits over the next decade.

“We’re going to be thanking senators that have been supportive and that are standing by their guns,” Gober said, noting that retiring Sen. Bob Corker of Tennessee said he would not give the OK to a tax package that increases deficits.

“Thank you for keeping your word,” read an ad aimed at Corker that ran in his home state.