Joe Manchin actually said...

We need to change code here as far as in the general public, but basically the policy that you all can adopt can lead to the cultural change...

So, there's no checks and balances. You don't check with someone else to make sure.

that person, whoever the President may be, has the sole ability to call for a nuclear strike?

Does the President of the United States have the absolute ability and the power to call for a nuclear strike without any input from Congress...