DEMOCRAT Presidential hopeful Barack Obama's campaign apologised to rival Hillary Clinton yesterday after one of his key foreign policy aides branded the former First Lady a desperate "monster".

By The Associated Press WASHINGTON (AP) - A former adviser to Barack Obama who resigned Friday after calling rival Hillary Rodham Clinton "a monster" said Obama may not be able to withdraw all U.S. combat troops from Iraq within a year as he has promised on the campaign trail.

By Margaret Talev McClatchy Newspapers WASHINGTON -- A top foreign policy adviser to Barack Obama resigned Friday after she called Hillary Clinton a "monster" and said that Obama's Iraq war withdrawal plan was a best-case scenario rather than a firm commitment.

WASHINGTON _ A top foreign policy adviser to Barack Obama resigned Friday after she called Hillary Clinton a "monster" and said that Obama's Iraq war withdrawal plan was a best-case scenario rather than a firm commitment.

A foreign policy aide to Sen. Barack Obama, D-Ill., has apologized for calling Democratic presidential rival Sen. Hillary Clinton, D-N.Y., a monster. Samantha Power made the comments to The Scotsman during a book tour in the United Kingdom.