In short (1)
Congress would not have to endorse busing in order to reject the currently proposed methods of curbing of it. These would invade the jurisdiction and responsibility of the judicial and executive branches in the enforcement of school desegregation law.
The American Bar Association has long since thrown its weight against the kind of constitutionally dubious antibusing legislation that has passed the Senate and is now before the House. Last week such a bill was challenged by attorneys general from three previous administrations (Johnson, Nixon, and Carter).
If Congress fails to get the message, it can hardly say it hasn't been offered it.