I believe Trump had a deal with Ryan and some the GOPe. Maybe it was support during the general election? I am not sure.
Trump gave the GOPe their opportunity to get it done. They failed. Trump, working with the GOPe and conservatives, will come back with a plan that will pass. Even democrats will eventually be forced to do something because the current program is crashing.
democrats will never vote against Obamacare..it is their cross and they will die on it if necessary..and with the gope amateurs in charge they have nothing to worry about