Tim Kaine actually said...

the AUMF would allow us to commence hostilities against a coalition partner, to commence hostilities against a group that had no connection ...

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.