WASHINGTON (AP) — For many House conservatives, President Barack Obama's decision to delay a central provision of his health care law has emerged as a major arguing point — not against that law but in opposition to immigration legislation.

In the weeks since the announcement that employers won't have to provide health insurance for another year, complaints have increased among House Republicans that they can't trust the Obama administration to implement any law they pass. That includes strict requirements for immigrants, tighter border security and genuine workplace hiring enforcement.

That refrain is heard often from GOP lawmakers, most of whom now are home for a five-week summer recess that's expected to feature demonstrations around the country by advocates as well as opponents of a broad immigration overhaul. It's one more daunting obstacle to House action after Senate passage in June of a sweeping bill to increase border security, remake rules for legal immigration and offer eventual citizenship to the estimated 11 million immigrants already in the U.S. illegally.