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Congressional Republicans pressed ahead Sunday with their emerging stance on immigration reform, arguing President Obama delaying the implementation of his health care law raises major concerns about whether he’ll enforce border security measures in immigration laws.

“We cannot fix with laws things the president refuses to do,” Iowa Republican Rep. Steve King told “Fox News Sunday.”

Though well known as one the House’s most conservative members, King has emerged as perhaps the chamber’s most vocal opponent of the Senate’s immigration bill, which includes $40 billion toward additional security along the U.S.-Mexico border and a path to citizenship for at least some of the roughly 11 million illegal immigrants now living in the United States.