El Salvador's President Nayib Bukele has offered for illegal immigrants – of any nationality – facing deportation in the U.S. to be booked in his country's prison system in exchange for a fee.This proposal comes after Secretary of State Marco Rubio met with Bukele at his lakeside country house outside San Salvador on Monday."We have offered the United States of America the opportunity to outsource part of its prison system," Bukele wrote on X Monday night. "We are willing to take in only convicted criminals (including convicted U.S. citizens) into our mega-prison (CECOT) in exchange for a fee. The fee