The Senate is expected to vote today on its version of the war spending bill granting more than $100 billion for the wars in Iraq and Afghanistan. The nonbinding measure calls for a withdrawal of U.S. combat troops from Iraq by March of next year. On Wednesday, President Bush repeated his vow to veto any bill calling for a withdrawal. House Speaker Nancy Pelosi called on President Bush to negotiate, saying, “Calm down with the threats. There is a new Congress in town. We respect your constitutional role. We want you to respect ours.”