In other books and columns for conservative sites such as '' WorldNetDaily '' and '' Human Events '' , Corsi has discussed conspiracy theories , such as the alleged plans for a North American government ; the conspiracy theory that President Barack Obama is not a United States citizen ; criticism of the United States government for allegedly covering up information about the terrorist attacks of September 11 , 2001 ; and alleged United States support of Iran in its attempts to develop nuclear weapons
terrorist attacks of September 11 , 2001
September 11 attacks
Jerome Corsi