 The Prime Minister has the power to declare war, as an exercise of the Royal Prerogative, without the approval of Parliament.Before or after the start of previous wars, there had normally been debate in Parliament; however for the first time a vote was held, apparently allowing Parliament to block the declaration of war, even though it was, "purely symbolic" and "not binding on the government".The debate was held on 18 March 2003, and lasted from midday to 10 pm, at which time the two Parliamentary votes were held.