Sen. Lee Zeldin, one of two Republicans seeking the GOP nomination to challenge Democratic Rep. Tim Bishop, received on Monday the endorsement of the U.S. Chamber of Commerce.

The pro-business lobby has shown that it’s getting involved in several New York House races, including the NY-19, where it is backing Rep. Chris Gibson and airing an ad on his behalf.

“I consider the support of the U.S. Chamber of Commerce especially valuable as it speaks directly to my record of support for businesses on Long Island and across New York,” Zeldin said in a statement. “I understand that in order for our quality of life to improve on Long Island, the success of our businesses is critical. As a Congressman, cutting red tape and improving the business climate for employers so that they can do what they do best—create jobs in our communities—will remain a top priority.”

Both Zeldin and former SEC prosecutor George Demos are competing for the Republican nomination in an unusually heated primary.

Demos has charged Zeldin cast votes in favor of the Affordable Care Act spending on the local level, while Zeldin has pointed to Demos receiving contributions from donors tied to Nancy Pelosi.