President Donald Trump quietly met a pair of former Colombian presidents last weekend at his Mar-a-Lago resort in Florida, thrusting his administration into an ugly power struggle in Latin America that threatens to undermine the country’s controversial peace agreement with rebel leaders.

Colombian President Juan Manuel Santos is expected to push Trump to support the peace accord with the Revolutionary Armed Forces of Colombia at their first meeting at the White House next month. He wants the Trump administration and Congress to maintain the $450 million in foreign aid promised by former President Barack Obama to implement the plan to end Latin America’s longest armed conflict.

The meeting between Trump and the former presidents, Álvaro Uribe and Andrés Pastrana – Colombia news media have reported it was arranged by an influential U.S. critic of the plan, Republican U.S. Sen. Marco Rubio of Florida – was not on the president’s schedule and was not disclosed to reporters who traveled with him to Palm Beach.