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.) is pushing back against Rep. Tom CottonTom CottonCruz offers bill to weaken labor board's power Overnight Finance: GOP offers measure to repeal arbitration rule | Feds fine Exxon M for Russian sanctions violations | Senate panel sticks with 2017 funding levels for budget | Trump tax nominee advances | Trump unveils first reg agenda Iran deal faces uncertain future under Trump MORE's (R-Ark.) recent TV attacks on immigration, using quotes from Sen. John McCain (R-Ariz.) to do so.

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Pryor is up with a new ad featuring McCain's quote that "anyone who calls it amnesty is not being intellectually honest," firing back at a recent Cotton ad that says Pryor "voted for amnesty [and] citizenship for illegals."

"Mark Pryor voted the same way as John McCain and many other Republican senators," Pryor's ad fires back. "Secure the border first. Pryor voted no amnesty, 20,000 new border agents, a 700-mile fence and a long-term solution. It's tough but fair. While Congressman Cotton voted to cut funding for border protection and played politics with our security."

With the ongoing humanitarian crisis at the border, immigration has taken on renewed life as a 2014 campaign issue in a number of states.

Pryor and Cotton are locked in a tight race, according to polls.