White House officials said the President could cancel his trip if he decided to use force against Baghdad.

The President may cancel and annul the award of the decoration to any person.

Russia's President, said to be tired, canceled a third meeting.

It would allow the President to cancel specific items of spending in appropriations bills and tax breaks that applied to no more than 100 taxpayers.

Instead, for spending and tax legislation, the President may cancel particular items within five days of signing a bill into law.

The veto would enable the President, in effect, to cancel one side of any bargain retroactively.

And, as the history of defense procurement shows, even when Presidents, let alone the Congress, cancel programs, they do not die.

The next President, the study said, should cancel future weapons rather than cut back on such things as training and ammunition.

Since then, the President has canceled 82 items from 11 laws, so there is no doubt that the power is more than theoretical.

It is not encouraging to read that the President himself frequently cancels his foreign policy briefings.