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Bruning and attorneys general from about two dozen other states are challenging the law in court, which Bruning has used on the campaign trail to paint himself as a thorn in the side of Obama and Democrats.

He traveled to Washington, D.C., in April for the Supreme Court's oral hearings on the constitutionality of the individual mandate component of the law.

Bruning has been regularly releasing new television ads as he works to defeat his two opponents in the GOP primary: state Sen. Deb FischerDeb FischerIvanka Trump turns to House GOP on paid family leave GOP senators pleased with Ivanka Trump meeting on family leave, child tax credits McCain threatens to block Trump's deputy Defense nominee MORE and state Treasurer Don Stenberg. The winner will face former Sen. Bob Kerrey (D-Neb.) in the general election.

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This post was updated at 12:03 p.m.