Four House Democrats traveled to El Salvador on Monday to pressure President Nayib Bukele and the Trump administration to release Kilmar Ábrego García, a Maryland resident who was deported last month despite a federal court order barring his removal.

After being denied access to Ábrego García during their visit, the lawmakers escalated their demands, calling on the Trump administration to provide “daily proof of life,” ensure access to legal counsel, and facilitate his immediate release, Time reported.

“Since we were not able to get the answers we need today from the embassy, we have written a letter just as of 30 minutes ago to Secretary of State Marco Rubio demanding daily proof of life for Mr. Ábrego García,” said Rep. Yassamin Ansari of Arizona, one of the House Democrats who went to El Salvador. “And of course, finally, demanding his safe return home.”

The delegation, comprised of Reps. Robert Garcia of California, Maxwell Frost of Florida, Maxine Dexter of Oregon, and Ansari, marks the latest Democratic effort to spotlight Kilmar Ábrego García’s case, which some legal scholars warn has pushed the U.S. toward a constitutional crisis.