WASHINGTON — The Trump administration, which in recent months had avoided public discussions of vaccine policy because of concern around the political repercussions, is changing course. AdvertisementThe order was a response to a court stalling previous changes to vaccine policy, Heidi Overton, a health policy adviser at the White House, said. Hospitals and doctors have chosen to ignore previous vaccine recommendations from the Trump administration, arguing federal officials aren’t offering evidence to back up policy overhauls. In May, the president signed an executive order pressing federal health agencies to continue changing the nation’s framework. The Trump administration was previously skittish about publicly touting its changes to vaccine policy.