WASHINGTON (CNN) -- In an impassioned speech on the on the Senate floor Tuesday, Sen. Joe Biden, D-Delaware, said the president's Iraq policy was "God awful" and directly responded to Sen. John McCain's contention that Democrats who believe the war should end should have the "courage" to cut off funding.

"I'm so tired of hearing this word about courage," Biden said angrily. "Have the courage to tell the administration 'stop this ridiculous policy you have. We're taking sides in a civil war."

Minutes earlier McCain, R-Arizona, said on the floor, "If any senator believes that our troops' sacrifice is truly in vain, the dictates of conscience demand that she or he act to prevent it. Those who would cut off all funding for this war, though I disagree deeply with their position and dread its consequences, have the courage of their convictions, and I respect them for it."

On Monday, Biden launched a new Web site to raise awareness of his efforts to change the president's policy in Iraq.

Both Biden and McCain are seeking their party's presidential nominations.

Watch Video: Watch Biden on the Senate floor

Related Video: McCain says U.S. can't 'walk away' from Iraq