Georgia Democratic House candidate Jon Ossoff is facing attacks from Republicans for backing the Iran nuclear deal, with a new TV ad calling his policies on national security matters too “risky.”

The National Republican Congressional Committee (NRCC) ad is the group's second spot highlighting Ossoff’s support for the deal. It also links Ossoff to Democratic leaders like House Minority Leader Nancy Pelosi (D-Calif.), who has been a go-to foil for the GOP.

“Not only did Jon Ossoff lie about his national security experience, he and Nancy Pelosi support policies that would make our country less safe,” said NRCC spokesman Matt Gorman. “Jon Ossoff is a risk Georgians shouldn’t have to take.”

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Ossoff supports the Iran deal and says he’ll oppose any efforts in Congress that block the deal’s implementation. His campaign website reflects that Ossoff will also make sure Iran complies with curbing its nuclear program.

“In Congress, Jon will push strongly for strict enforcement and uncompromising monitoring of Iran’s compliance with obligations to restrict uranium enrichment and to cease ballistic tests,” the website says.

Ossoff faces Republican Karen Handel in the June 20 runoff to fill the House seat vacated by Health and Human Services Secretary Tom Price.

National Democrats are under pressure to score a special election victory after close races for open seats in Kansas and Montana.

Ossoff has raised more money than any candidate ever running for the lower chamber, and the race is the most expensive House race in U.S. history.

Republicans are spending heavily in the June runoff to match Ossoff and Democrats’ high-dollar spending, pouring in nearly $10 million according to the Atlanta Journal-Constitution.

Of the $10 million GOP spending, the NRCC has spent more than $4.1 million.

Republicans have honed in on Ossoff’s national security experience as a frequent line of attack. Nonpartisan fact-checkers have said that the Georgia Democrat has inflated his resume regarding his national security work as a former congressional aide.