A man is being held in Florida by federal authorities on charges of threatening to assassinate Democratic presidential candidate Barack Obama.

Raymond Hunter Geisel was ordered held without bail Thursday at a brief court hearing.

The Secret Service says Geisel made the threat during a training class for bail bondsmen in Miami in late July. Another tipster said Geisel also threatened President Bush.

A search of Geisel's SUV and hotel room uncovered a loaded handgun, knives, dozens of rounds of ammunition, body armor and a machete. The SUV was wired with emergency lights.

Geisel told the Secret Service he was originally from Bangor, Maine. He contended he made no threat against either Obama or the president.