The Trump administration will be arguing against mandatory coverage for pre-existing conditions.
From the article linked to above:
“On the whole, the Blahous analysis finds that total health spending would actually decline under the Sanders plan, compared with the status quo, with the feds paying a lot more, but everybody else paying nothing. And more people would get coverage, since everybody would be eligible. ”
Of course, Republicans will blame Obama who hasn’t been president for 18 months.