The Trump administration and the president of El Salvador said Monday that they'd struck a deal allowing the U.S. to ship both detained migrants and imprisoned citizens to the tiny Central American nation,

President Bukele, who labels himself as the "coolest dictator" and a "philosopher king," has built election success and immense popularity on an extreme security policy to combat gang violence in El Salvador, incarcerating large quantities of alleged gang members and securing a massive drop in homicides.

After meeting Secretary of State Marco Rubio, El Salvador's president has offered to house U.S. deportees and even American inmates in his country's "mega-prison."

Secretary of State Marco Rubio said he is reviewing an offer from the president of El Salvador to deport not just undocumented immigrants but also American prisoners to a mega-prison in the South American country.

The Trump administration is assessing whether it could take up El Salvador's offer to house U.S. citizens convicted of crimes in its jails, Secretary of State Marco Rubio said on Tuesday, despite the apparent illegality of such a move.

He met with Salvadoran President Nayib Bukele and senior officials at Bukele's residence on Lake Coatepeque outside the capital for almost three hours, where they agreed to go beyond El Salvador's acceptance of its own deported citizens.

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.