There’s nobody I would rather have negotiating for me.
OK. Would you not want to know what, if anything is non-negotiable?
For example, he's been back and forth on funding for Planned Parenthood (the "good" parts).
What exactly IS his bottom line?
What about pro-life legislation? Has his thinking gone beyond superstars and losers? Could he negotiate away the losers' lives?
Don't you want a full picture of what your negotiator is representing for you and why, so you can assure yourself that all your interests are being protected?
Other examples could be given.