Trump administration threatens future of HIV research hub.

A researcher works March 16, 2012, in the stem cell lab on the Stanford University campus in Palo Alto, Calif. (Paul Sakuma/AP)

The Trump administration has thrown into doubt a multimillion-dollar research contract to test new treatments for HIV that relies on fetal tissue — work targeted by antiabortion lawmakers and social conservatives aligned with the president.

The turmoil over the…