US President George Bush said it was only a matter of time until Al Qaeda leader Osama bin Laden faces justice. "I'm just telling you we're dismantling Al Qaeda one person at a time. We're on the hunt,' Bush said at a congressional campaign event at Reno, Nevada. "And it's just a matter of time before Osama bin Laden gets the justice he deserves," he said. The US leader struck back at critics of the war, calling it a central front in the war on terror. "Success in Iraq will help make this country more secure. Failure in Iraq will mean that we will have left behind a treacherous world for children and our grandchildren," Bush said. "But if you don't take my word, take the word of Osama bin Laden, or Mr. (Ayman) Zawahiri, about the importance of Iraq. The number one and two of Al Qaeda have made it clear that Iraq is a central front in the war on terror," he said. "And their ambitions are to drive the United States out of Iraq," Bush said. "They want us to leave so they can a safe haven from which to plot and plan new attacks against the Unites States of America"' he said.