Technically Congress is ALREADY on Obamacare...HHS rules (Obama) allowed them to use the “D.C. small business exchange” (SHOP) as a “small business employer” therefore allowing them to use their federal med. ins. subsidy to buy insurance for their “employees”...Mr. Trump could instruct his HHS secretary to disallow Congress’s application for the “SHOP” exchange, thereby making Congress buy Obamacare on the regular individual exchange(s). My understanding anyway.