Emperor of America is a novel by Richard Condon published in 1990. It is a satire about an "Imperial Presidency", poking fun at Ronald Reagan.
A nuclear device explodes in Washington and destroys the White House. The Royalist Party and the National Rifle Association are nominally those responsible but Condon's principal target is Reaganism and its legacy, embodied in the character of an Army colonel, Caesare Appleton, who becomes Emperor Caesare I.