The Trump administration and the president of El Salvador said they struck a deal allowing the U.S. to ship detained migrants and imprisoned criminals to a mega-prison there. Trump said Tuesday he was exploring whether he can move forward with offer even as he and Secretary of State Marco Rubio both say it raises clear legal issues.

President Nayib Bukele has offered to jail deported criminals from the United States. His prisons have earned him a reputation as being tough on crime, but have raised alarms over rights abuses.