The Republican-affiliated Crossroads GPS is launching new ads in Iowa and Arkansas, attacking Rep. Bruce BraleyBruce BraleyOPINION | Tax reform, not Trump-McConnell feuds, will make 2018 a win for GOP Ten years later, House Dems reunite and look forward Trump: Ernst wanted 'more seasoning' before entertaining VP offer MORE (D-Iowa) on the Veterans Affairs Department and hitting Sen. Mark PryorMark PryorMedicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm MORE (D-Ark.) on Medicare and Social Security.

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The Crossroads ad criticizes Braley for missing committee meetings overseeing the VA, an issue that has nagged his campaign.

"Veterans died waiting for care," the Iowa ad says. "But Congressman Braley actually missed 75 percent of full committee meetings as a member of the Veterans Affairs Committee."

The Arkansas spot goes after Pryor on Medicare, ObamaCare and Social Security, seemingly looking to muddy the issue after recent Democratic attacks on Rep. Tom CottonTom CottonHouse bill set to reignite debate on warrantless surveillance Republicans jockey for position on immigration The Hill's 12:30 Report MORE's (R-Ark.) Medicare views.

The ad accuses of Pryor of talking about raising the Social Security retirement age and calls on him to "protect our Medicare by repealing ObamaCare."

Both races are top GOP priorities. Cotton and Pryor have been locked in a tight and nasty race for months, while Braley's missteps have put him in a coin-flip race against Iowa state Sen. Joni Ernst (R).

Braley's campaign fired back.

"It's shameful that Karl Rove is trying to play politics with our veterans and distort Bruce Braley’s impressive accomplishments for Iowa’s veterans," Iowa State Representative and Army Reserve Major Todd Prichard (D) said in a statement from the campaign.

This post was updated at 3:00 p.m.