A Florida Keys man charged in an undercover FBI investigation with plotting to set off a backpack bomb in solidarity with the Islamic State group is set to enter a plea in court.

An arraignment hearing is scheduled Tuesday in Miami for 23-year-old Harlem Suarez of Key West, who is expected to plead not guilty. Suarez faces life in prison if convicted of attempting to use a weapon of mass destruction and providing material support to terrorists.

Defense attorney Richard Della Fera says Suarez is no terrorist.

The FBI says Suarez wanted to detonate a homemade bomb on a Key West beach. He was arrested in July after taking possession of an inert explosive device.

The FBI sting began after Suarez allegedly posted pro-Islamic State rhetoric on his Facebook page.