Britain's opposition Conservative Party is calling on Parliament on Monday to back a formal inquiry into the decision to go to war in Iraq, the Associated Press reported. «We want the principle established that there must be an inquiry. It's about making sure we don't make the same mistakes again,» said Liam Fox, the party's defense spokesman in Parliament. Prime Minister Tony Blair has ruled out an inquiry so long as British troops are deployed on active duty in Iraq. The Conservative Party strongly supported Blair's decision to back the U.S.-led invasion, and voted for war in a key House of Commons debate on March 18, 2003, shortly before the conflict began.