U.S. Secretary of State Marco Rubio on Sunday warned Panama's President Jose Raul Mulino that Washington will "take measures necessary" if Panama does not immediately take steps to end what President Donald Trump sees as China's influence and control over the Panama Canal.

Among the countries for which waivers for certain programs have been submitted are Panama, Costa Rica, the Dominican Republic and its neighbor, Haiti. Although Rubio will not be traveling to Haiti, the State Department has already allowed some $41 million in support of an international peacekeeping force there to go ahead.

Secretary of State Marco Rubio says President Donald Trump’s desire to acquire Greenland and retake control of the Panama Canal is driven by legitimate national security interests stemming from growing concerns about Chinese activity in the Arctic and in Latin America.