“They may be foolish enough to go after DACA again, but I hope they know and see that America has the DREAMERS’ backs,” Cecilia Muñoz, who served as Mr. Obama’s top adviser on Hispanic issues and domestic policy, wrote on Twitter. She added a warning to the president and his aides about the political power of the pro-immigrant movement.
“We see you, Donald Trump, we see you Stephen Miller,” she said, “and we’re coming for you.”
Whatever the president decides to do, the debate over what happens to the Dreamers in the long run will play out most starkly in the presidential contest between Mr. Trump and the presumptive Democratic nominee, former Vice President Joseph R. Biden Jr.
Mr. Biden hailed the ruling on Thursday and vowed to introduce legislation on his first day in office that would give the young immigrants permanent legal status in the United States. Efforts to pass such legislation have failed for more than a decade, but he said the court’s temporary protections raise the stakes of the November election.
“I will continue to stand with DACA recipients, their parents and their families at every step, and in November, joined by millions across this country, we will reject the president who tried to rip so many of our family members, friends and co-workers out of our lives,” Mr. Biden said in a statement.
The issue is already at the forefront of several key Senate races. Hours after the ruling, a Democratic group issued a news release calling attention to votes by Senator Cory Gardner, a moderate Republican from Colorado.
“Time and again Cory Gardner voted to repeal DACA and deport thousands of Colorado Dreamers and no amount of election season revisionist history from Gardner can change that,” wrote Zach Hudson, a spokesman for the group, American Bridge.
In Arizona, the court ruling could help efforts by Democrats who are seeking to defeat Senator Martha McSally. Tomás Robles Jr., the co-executive director of Living United for Change in Arizona, said Thursday that the temporary nature of the decision created an energy and immediacy around defeating Ms. McSally and blocking Mr. Trump’s re-election.