Last week the Democrat-controlled House voted to set a deadline for US troops to withdraw from Iraq. Now the Senate has followed suit. President Bush is threatening to veto, but the deadline is in the very bill funding the war, so if he does, the troops won't get paid.
Basically, this is a game of chicken to see who will blink first - the President or Congress. I expect the political atmosphere in Washington to get very heated over the next couple of weeks as a result.