Donald Trumpís corporate biography drops Barack Obama birther referenceDonald Trumpís involvement with the birther movement, which centred around the conspiracy theory that Barack Obama was not born in the United States, has been removed from his corporate biography. The line, which has been included in the President's biography since 2015, was removed at some point between 13 January and 24 January this year, by the Trump Organisation. On multiple occasions he challenged Mr Obama to release his birth certificate, which he eventually did.