WASHINGTON — House Speaker Nancy Pelosi said today she sees little support for sending more U.S. troops to Afghanistan, forecasting a potential showdown with the Obama administration over how to win the war.

Pelosi's comments put President Barack Obama in an uneasy position as he considers whether to side with his top commander in Afghanistan, who is expected in coming weeks to ask for more troops and other resources.

She is the highest-ranking Democrat to signal any White House or Pentagon push for more troops will be resisted in Congress.

"I don't think there's a great deal of support for sending more troops to Afghanistan in the country or in the Congress," Pelosi, D-Calif., told reporters.

Rep. John P. Murtha, chairman of a House Appropriations panel that would approve paying for any buildup, described himself as "very nervous" about sending more troops to Afghanistan. Murtha, D-Pa., a Marine veteran, said today he might support it if the Obama administration withdraws a significant number of soldiers from Iraq in the very near future.

Senate Majority Leader Harry Reid, meanwhile, said he is urging Democrats to withhold judgment until Obama decides what to do.