Nauert said that Martinelli's extradition followed normal procedures established by the countries' bilateral extradition treaty.
Supporters of the former president planned to rally later Monday in front of Panama's Supreme Court.
Panama's President Ricardo Martinelli addresses the 68th United Nations General Assembly at U.N. headquarters in NY, U.S. on September 25, 2013.
The International Criminal Police Organization, or Interpol, issued a warrant for Martinelli Berrocal's arrest in May 2017. Martinelli's petition for a writ of habeas corpus was denied by the federal district court in the Southern District of Florida in January.
Panamanian authorities said Martinelli was extradited at 8:44 a.m. (1344 GMT).
Attorneys Marcos Daniel Jimenez of Coral Gables, David Adrian Howard of Miami, Ann Marie St. Peter-Griffith of Kasowitz Benson Torres, and John Richard Byrne and Jordi CarloSantiago Martinez-Cid of Leon Cosgrove represented Martinelli Berrocal. Under this council, a "Special Services" unit carried out confidential activities at the president's direction, including the unsanctioned intercept and recording of communications from the cell phones and computers of Martinelli's identified targets.
With the extradition now complete, Martinelli's case will now move forward in the Panamanian legal system.
Panama's former President Ricardo Martinelli has been extradited to his homeland from the United States, where he has been held on charges of political espionage and corruption, one of his lawyers said.