Mark Lamb wins primary to replace Andy Biggs despite sex scandal plaguing campaign

Published July 22, 2026 8:37am ET



Former Pinal County sheriff Mark Lamb defeated self-funded businessman Daniel Keenan in the open Republican primary for Arizona’s 5th Congressional District on Tuesday evening, as the law enforcement officer rose above his sex scandal allegations to make it to the general election.

Lamb, who was endorsed by President Donald Trump, had 58.4% of the vote as of Wednesday morning, compared to Keenan’s 41.6%. Lamb’s win marks another Grand Canyon State victory for the president’s endorsement, showing how far Trump’s and Turning Point USA’s backing can take a GOP primary candidate in the state, even through a scandal.

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