Tim Kaine actually said...

Congress has to jealously guard its prerogative to commence hostilities and to decide against whom those hostilities will be commenced.

Congress therefore weakens not only the President but also itself when and if it declines to face up to the threats against our Nation.

No one suggests handing the President a blank check to carry out the power to declare war.

To replace the AUMF would be risky and unwise at this time.