A change of plea hearing is set Wednesday for 20-year-old Joaquin Amador Serrapio Jr. He had previously pleaded not guilty.
Federal prosecutors say Serrapio posted threats on Facebook in February coinciding with a speech Obama gave in Miami.
One post threatened to put a bullet in the president's head. Another asked if anyone wanted to help with a presidential assassination.
There's no indication Serrapio intended to act on the threats. His lawyer has said Serrapio never wanted to hurt the president. The lawyer didn't immediately respond to an email Thursday.
Serrapio faces a maximum five-year prison sentence.
