US military commanders in Afghanistan are pushing for more ground raids across the border into Pakistan's tribal areas, leading to a debate over the "controversial" proposal. The plan for forays into the militant stronghold in North Waziristan has not yet been approved, but military and political leaders say a "renewed sense of urgency" has taken hold, as the deadline - July 2011 - approaches for the Obama administration to begin withdrawing its forces from Afghanistan. Military commanders have said that by using American Special Operations troops if militants were captured, brought back across the border into Afghanistan and interrogated, "it could bring an intelligence windfall", The New York Times reported Tuesday. In interviews in Washington and Kabul, American officials said they were drawing up plans to begin ground operations to capture or kill leaders from the Taliban and the Haqqani network. They said they are particularly "eager" to capture, as opposed to kill, militant leaders, who can offer intelligence to guide future operations.