Fox News chief international correspondent Steve Harrigan reports on key takeaways from Secretary of State Marco Rubio's meeting with the Panamanian president on 'The Story.'

President José Mulino said Panama's sovereignty over the world's second busiest waterway is not up for discussion.

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. The warning follows President Donald Trump's vow to retake the canal and a meeting between Rubio and Jose Raul Mulino,

During a trip to El Salvador on Monday, Secretary of State Marco Rubio told reporters he has been named acting director of the U.S. Agency for International Development (USAID), effectively subsuming the agency into the State Department.

Secretary of State Marco Rubio said he is now acting director of the U.S. Agency for International Development (USAID) while on a trip to El Salvador.

Secretary of State Marco Rubio announced Monday that he also has been tapped as acting administrator of the embattled US Agency for International Development, while federal cost-cutter-in-chief Elon Musk works to “shut it down.