The White House has not set a cutoff date for U.N. weapons inspections in Iraq, but the United States will not tolerate inspections that continue for months on end, senior administration officials said Friday. White House officials dismissed reports that a lengthy inspections period might be allowed in a bid to win support from more U.S. allies for military action against Iraq. However, a senior administration official said the United States will let the inspections continue as it consults with allies and has not set a timetable for ending them. US Secretary of State Colin Powell has embarked on a last mission to drum up support for action against Iraq before a key meeting of the United Nations Security Council on Monday. Mr Powell is due to arrive at the World Economic Forum in Davos, Switzerland on Saturday morning, where he is expected to spend the weekend holding bilateral talks with world leaders attending the summit. On Monday, the UN Security Council convenes to hear the first formal report on the situation in Iraq from chief arms inspector, Hans Blix, whose UN-mandated team has been checking sites in the country for weapons of mass destruction.