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Mr. Obama resisted for years, but five months before election day, facing sagging support among Hispanics, he changed his stance and issued a new policy granting many young illegal immigrants tentative legal status and work permits.

After that previous reversal, activists hope — and some expect — Mr. Obama to change his mind this year and expand his stay of deportations to include almost all illegal immigrants.

“When he said he didn’t have the power to stop deporting Dreamers, we built a powerful case with grass-roots pressure and legal analysis and won a monumental victory with Deferred Action for Childhood Arrivals,” said Cristina Jimenez, managing director of United We Dream. “He does have the power to stop deportations, and we will keep challenging him.”