Secretary of State Marco Rubio is arguing that the presence of two Hong Kong companies and other Chinese firms violates a treaty Panama has with the U.S.

Secretary of State Marco Rubio met with Panamanian President José Raúl Mulino in Panama over the weekend, State Department spokesperson Tammy Bruce said in a readout of their meeting.

U.S. Secretary of State Marco Rubio has told Panama’s president that the Central American ally must reduce Chinese influence over the Panama Canal area or face potential retaliation from the Trump administration.