No they passed a law putting them on Obamacare. Obama's executive order allowed for the subsidies for their insurance. Congress taketh away and Congress can giveth.
You specifically said in your comment that it would require Congress to repeal the law that makes them subject to Obamacare, which Obama exempted them from. To repeal a law requires another law. I am saying that it would be politically difficult, even for these pinheads, to pass a law that specifically exempts them from Obamacare (and Trump would repeal it.) That’s why they loved getting the exemption instead.