WASHINGTON (CNN) -- In the final hours before an expected vote Friday, lawmakers took to the House floor with impassioned arguments over a resolution rejecting President Bush's plan to send more U.S. troops to Iraq.

House Speaker Nancy Pelosi, D-California, said the resolution opposing Bush's plan "may be non-binding, but it will send a strong message to the president: We here in Congress are committed to protecting and supporting our troops." Applause followed in the chamber.

"The passage of this legislation will signal a change in direction in Iraq that will end the fighting and bring our troops home safely and soon," she said.

Ileana Ros-Lehtinen, R-Florida, ranking Republican on the Foreign Affairs Committee, followed Pelosi and rejected that view. "One vision sees no hope for us in Iraq and counsels that we withdraw, just give up," she said. "By contrast, the other vision focuses on success."

She said the resolution, backed by many Democrats and some Republicans, "lacks hope" and "accepts defeat."

It was clear the resolution has enough support to pass. It will mark the first time the Congress has acted to reject a plan by the president during the four years of the war.

The House vote could set the stage for a showdown in the Senate. Democratic leaders said they plan to bring up the resolution for a key procedural vote Saturday.