For years, the government has helped secure lawyers for minors who arrive at the southern border. But a contract dispute has forced many children to face immigration judges on their own.
Vaccine safety experts say more research into the side effects would be welcome yet question whether the health secretary’s effort will be grounded in science.
Senator Patty Murray, a former chair of the Senate health committee, is forming a group of experts to examine how to insulate the C.D.C. from political interference.