Republican state Rep. Geoff Diehl is gearing up to formally launch his challenge to Democratic U.S. Sen. Elizabeth Warren.
Diehl, who served as co-chair of President Donald Trump's campaign in Massachusetts, is scheduled to make the announcement Tuesday evening in the town of Whitman, Massachusetts, where he lives.
Diehl has said in a radio ad that he wants to "make Massachusetts great again."
Warren is running for a second six-year term and has frequently sparred with Trump both verbally and on social media.
Shiva Ayyadurai, a Cambridge technology entrepreneur, also is seeking the GOP nomination for the seat held by Warren.
Warren had more than $11 million in her campaign account as of the end of June, compared to nearly $260,000 in Deihl's account and nearly $28,000 in Ayyadurai's account.