Barack Obama was the President of the United States of America in 2016.
Obama was featured on a talk-show with Jimmy Kimmel, where they joked about aliens being held in Area 51. Mulder expressed dismay at this, feeling they were mocking his life's work. (TXF: "My Struggle")
During his presidency, there were conspiracy theorists who refused to believe that Obama was born in the United States or was a U.S. citizen. These people were referred to as "Birthers". (TXF: "The Lost Art of Forehead Sweat")