Washington ? A schism deepened Wednesday between U.S. war leaders and Congress as lawmakers — crucial Democrats among them — challenged Pentagon assertions that progress is picking up in Afghanistan.

Congressional hearings stepped up pressure on the Pentagon, with Defense Secretary Robert Gates complaining about negative perceptions taking root in Washington about the war. Another top military official acknowledged feeling “angst” about the conflict.

But military leaders said the U.S. effort is advancing. “I think that we are regaining the initiative,” Gates told a skeptical Senate panel. “I think that we are making headway.”