On the bright side, he's only around once per month. Talk to your regular OB. It sounds like she's supportive and might be able to shield you from having to see this specialist even if he ultimately does the c-section. Don't sign the paperwork. I agree with others here that there's no such thing as an emergency tubal. It's convenient for him, nothing more. And, not agreeing to that certainly doesn't keep him from doing a c-section. Don't listen to any "because you have Medicaid" nonsense. (As if normal insurance providers are super accommodating and easy to work with?!? Ha!!)
I so wish I could transport my OB up to you. He's super nice, agreeable even when he doesn't agree with me, and a great surgeon too. He last did my 5th c-section. He of course asked all the questions about future birth control and gave all the warnings as he should, but once he'd said his bit, he didn't pressure me into anything. When all was said and done, his last comment to me before leaving the operating room was something like, "I stitched you up extra well in case you need to use this again."
Oh, and yes I had Medicaid and never heard the phrase "because you have Medicaid..." from him.