Speaker Nancy Pelosi has said she expects the next challenge to Bush’s war policies to come in the form of legislation requiring the Pentagon to adhere to strict training and readiness standards in the case of troops ticketed for the war zone. Rep. John Murtha, D-Pa., the leading advocate of that approach, has said it would effectively deny Bush the ability to proceed with the troop buildup that has been partially implemented since he announced it in January. Some Senate Democrats have been privately critical of that approach, saying it would have little chance of passing and could easily backfire politically.160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! WASHINGTON – Determined to challenge President George W. Bush, Senate Democrats are drafting legislation to limit the mission of U.S. troops in Iraq, effectively revoking the broad authority Congress granted in 2002, officials said Thursday. While these officials said the precise wording of the measure remains unsettled, one draft would restrict American troops in Iraq to combating al-Qaida, training Iraqi army and police forces, maintaining Iraq’s territorial integrity and otherwise proceeding with the withdrawal of combat forces. The officials, Democratic aides and others familiar with private discussions, spoke only on condition of anonymity, saying rank-and-file senators had not yet been briefed on the effort. They added, though, the Senate Majority Leader Harry Reid is expected to present the proposal to fellow Democrats early next week for their consideration. The plan is to attempt to add the measure to anti-terrorism legislation that scheduled to be on the Senate floor next week and the week following. Jim Manley, a spokesman for Reid, declined to discuss the deliberations, saying only, “No final decisions have been made on how to proceed.” Any attempt to limit Bush’s powers as commander in chief would likely face strong opposition from Republican allies of the administration in the Senate and could also face a veto threat. The decision to try to limit the military mission marks the next move in what Reid and other Senate war critics have said will be a multistep effort to force a change in Bush’s strategy and eventually force an end to U.S. participation in the nearly four-year-old war. Earlier efforts to pass a nonbinding measure critical of Bush’s decision to deploy 21,500 additional troops ended in gridlock after Senate Republicans blocked votes on two separate measures. The emerging Senate plan differs markedly from an approach favored by critics of the war in the House, where a nonbinding measure passed last week.