Sheldon Whitehouse actually said...

Colin Powell has never been a Member of Congress, and he is a person who I think America has confidence in on national security matters.

But certainly since Congress is not interrogation experts, it would be a mistake for us to foreclose your ability to apply Miranda warnings ...

That is not a great track record.

I would urge you to take a look at the way in which the counsel for folks at Guantanamo are treated.