A conservative group backed by billionaire donors Charles and David Koch is preparing to launch a six-figure ad campaign targeting Republican and Democratic lawmakers who voted for the $1.3 trillion spending package in March.

Americans for Prosperity will drop the radio, print, digital and direct mail ads in the lawmaker’s districts as they arrive home for Memorial Day weekend.

The Koch network is typically supportive of Republicans but they have been deeply disappointed by the GOP-controlled Congress this year. Lawmakers passed the massive spending bill but have failed to move on the Koch network’s legislative priorities, such as immigration reform.

“It’s time to take a hard look at what lawmakers say, and what they actually do when it comes to reining in overspending,” said AFP spokesman Bill Riggs. “The $1.3 trillion omnibus spending bill passed by Congress in March showed a complete disregard for fiscal responsibility. Both parties are responsible for putting the country on an unsustainable fiscal path, which is why AFP is committed to holding both parties accountable."

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The Republicans who will be targeted by the ad campaign are Reps. Hal Rogers Harold (Hal) Dallas RogersHouse Democrats push for resuming aid to Palestinians in spending bill House panel approves bill funding WHO, paring back abortion restrictions Democrats take aim at Trump's policies on 2021 funding markups MORE (Ky.), Lou Barletta Louis (Lou) James BarlettaBottom Line Ex-GOP congressman to lead group to protect Italian products from tariffs Head of Pennsylvania GOP resigns over alleged explicit texts MORE (Penn.), Mike Bishop (Mich.), Mike Simpson MIchael (Mike) Keith SimpsonDuring a time of uncertainty, Great American Outdoors Act deserves our support Dentists want coronavirus testing kits before reopening MLB, Congress play hardball in fight over minor leagues MORE (Idaho), John Carter John Rice CarterDonna Imam wins Democratic runoff to face Rep. John Carter House panel advances bill banning construction on bases with Confederate names Democrats see victory in Trump culture war MORE (Texas), Robert Aderholt Robert Brown AderholtLobbying world The Hill's Coronavirus Report: WHO vs. Trump; Bernie's out Bottom line MORE (Ala.), Mark Amodei Mark Eugene AmodeiBipartisan lawmakers call for Postal Service relief Mnuchin details IRS challenges with cash-only marijuana businesses On The Trail: Democrats plan to hammer Trump on Social Security, Medicare MORE (Nev.), Jeff Fortenberry Jeffrey (Jeff) Lane FortenberrySave wildlife, save ourselves Lawmakers cry foul as Trump considers retreating from Open Skies Treaty Where do we go from here? Conservation can show the way MORE (Neb.), Tom Rooney Thomas (Tom) Joseph RooneyHouse Dem calls on lawmakers to 'insulate' election process following Mueller report Hill-HarrisX poll: 76 percent oppose Trump pardoning former campaign aides Dems fear Trump is looking at presidential pardons MORE (Fla.), and Ken Calvert Kenneth (Ken) Stanton CalvertMORE (Calif.).

AFP will also go after Democratic Reps. Stephanie Murphy Stephanie MurphyDemocrats scramble on COVID-19 relief amid division, Trump surprise Bank lobbying group launches ad backing Collins reelection bid House Democrats call on State Department for information on Uighur prisoner Ekpar Asat MORE (Fla.), Debbie Wasserman Schultz Deborah (Debbie) Wasserman SchultzFlorida Democrat introduces bill to recognize Puerto Rico statehood referendum Five things to watch at the Democratic National Convention Michelle Obama wishes Barack a happy birthday: 'My favorite guy' MORE (Fla.), Pete Visclosky (Ind.), Henry Cuellar (Texas), Matt Cartwright Matthew (Matt) Alton CartwrightRaces heat up for House leadership posts Trump Jr. seeks to elect 'new blood' to Republican Party Republicans face worsening outlook in battle for House MORE (Penn.), Beto O’Rourke (Texas), and Tom O’Halleran (Ariz.).

But AFP intends to reward some Republicans who voted against the bill. They will run ads thanking GOP Reps. Dave Brat (Va.), Glen Grothman (Wis.), Jim Renacci James (Jim) B. RenacciOhio is suddenly a 2020 battleground Democrats fear Ohio slipping further away in 2020 Medicare for All won't deliver what Democrats promise MORE (Ohio), Steve Pearce Stevan (Steve) Edward PearceFive Latinas who could be Biden's running mate New Mexico Dems brace for crowded race to succeed Udall The 31 Trump districts that will determine the next House majority MORE (N.M.), Chris Stewart Christopher (Chris) Douglas StewartAtlanta Wendy's 911 call the night of Rayshard Brooks's death released Tyler Perry offers to pay for funeral of Rayshard Brooks Current, former NHL players form diversity coalition to fight intolerance in hockey MORE (Utah), Jason Lewis Jason Mark LewisThe Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins GOP Senate candidate says Trump, Republicans will surprise in Minnesota Tina Smith wins Democratic Senate primary in Minnesota MORE (Minn.), Tom Garrett Thomas (Tom) Alexander GarrettInternal poll shows neck-and-neck race brewing in Virginia House contest GOP congressman loses primary after officiating gay wedding Virginia GOP to pick House nominee after candidate misses filing deadline MORE (Va), Ted Budd Theodore (Ted) Paul BuddHouse Dems introduce bill to require masks on planes and in airports Bipartisan bill introduced to require TSA to take temperature checks How to combat substance abuse during COVID-19 MORE (N.C.), Marsha Blackburn Marsha BlackburnTaylor Swift on National Voter Registration Day: 'We need everyone' Democrats smell blood with new DHS whistleblower complaint Hillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections MORE (Tenn.), Andy Harris Andrew (Andy) Peter HarrisCongressman who denounced mask wearing overseeing the trial of a drug to treat COVID-19 Pelosi must go — the House is in dire need of new leadership Ukraine language in GOP platform underscores Trump tensions MORE (Md.), Tom Emmer Thomas (Tom) Earl EmmerHouse Democrats' campaign arm reserves .6M in ads in competitive districts The Hill's Convention Report: Trump to attack Biden at final night of convention | Speech comes amid hurricane, racial justice protests | Biden accuses Trump of 'rooting' for violence Republicans cast Trump as best choice for women MORE (Minn.), Rod Blum (Iowa) and Mike Coffman Michael (Mike) Howard CoffmanColorado mayor says he called protesters 'domestic terrorists' out of 'frustration' Colorado governor directs officials to reexamine death of Elijah McClain in police custody Petition demanding justice for Elijah McClain surpasses 2 million signatures MORE (Colo.).

The group is hoping the ad campaign will pressure lawmakers to rein in spending ahead of the September funding deadline, which comes just before the midterm elections.

“Congress did the right thing when it passed the Tax Cuts and Jobs Act, but failing to control spending will undermine it,” Riggs said. “Lawmakers will have another chance to demonstrate their commitment to fiscal responsibility later this year when they consider 2019 funding legislation. We urge them to start now, seize the opportunity to stop overspending and deliver the president a spending bill he can sign.”