Guatemalan President Otto Pérez Molina announced Friday that his vice president, Roxana Baldetti, was resigning after one of her top aides was accused of participating in a customs bribery ring.

The announcement came two days after Guatemala‘s Supreme Court called on Congress to remove Baldetti’s immunity from prosecution, clearing the way for possible legal action against the vice president.

Pérez said Baldetti had voluntarily left the post “in order to participate in and collaborate with the necessary investigations and above all with due process of the law.”

“Her decision is personal, thoughtful, tough and brave,” Pérez said, as he announced her resignation.

Nearly three weeks ago prosecutors uncovered the customs bribery ring following an investigation by the U.N. International Commission Against Impunity, accusing top tax officials and Baldetti’s private secretary, Juan Carlos Monzón, of involvement.