The president can veto any bill sent to him by congress, and that includes the budget. Should the Democrats control both houses, this is a real possibility. Ho

The president can veto any bill sent to him by congress, and that includes the budget. Should the Democrats control both houses, this is a real possibility. However, it's unlikely to come to that. Instead, a political process would happen in which the president makes his intent known, and Republicans use the threat as a tool to get a budget more inline with what the president proposed in the first place.