Hillary Clinton has a massive lead among Democrats.
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The U.S. and other world powers have been seeking a deal on Iran's nuclear program.
Paul also wants to set a one-year limit on operations.
The Arizona GOP senators write in op-ed that the actions lack legal justification.
Rep. Luis Gutierrez said GOP has 180 days before the first person applies for a work permit.
The Democrat said it would be a mistake for GOP to shut down the government over immigration.
"We are going to shut down the president and his actions," the Texas Republican said.
"Ninety-three percent of blacks in America are killed by other blacks," he said.