Why? Bush is letting the country down, not congress (in this instance). Illegal immigration is ALREADY illegal. Bush is the executive in charge of protecting the border, not congress. Do you want congress to pass a law to make it even more illegal?
Obviously you don't have a clue how our government works. In order for the executive branch to implement any of the ideas like walls and fences that you people drool over, Congress would first have to appropriate the money. The President cannot simply "close the border" on a whim without the necessary appropriations from Congress. Of course this is just about the Bush haters on FR using this as an excuse to attack the President for a problem that existed long before January 20, 2001.