Panamanian officials offer concessions on Rubio’s first overseas stop, but say they cannot negotiate on control of the waterway.

Rubio will be pressing Trump’s top focus — curbing illegal immigration — but has also said he will be bringing the message that the U.S. wants to reclaim control over the Panama Canal despite intense resistance from regional leaders to combat China's growing influence in the hemisphere.

US Secretary of State Marco Rubio has demanded that Panama make "immediate changes" to what he calls the "influence and control" of China over the Panama Canal. America's top diplomat said Panama must act or the US would take necessary measures to protect its rights under a treaty between the two countries.