Dario Jimenez, relying on the government’s promise that he could live in the United States, in 1990 uprooted his life and that of his wife and their two children to move here from the Philippines. But in 2007, the government, which originally told him that he could stay because his mother was a U.S. citizen, revoked that decision, based on Jimenez’s 1986 marriage.

That didn’t sit right with Jeremy Rosen, a partner at Horvitz & Levy in Encino, Calif. Most people are held to the promises they make, but “the government has lots of ways out,” he said.