WASHINGTON—The Trump administration is weighing a withdrawal of thousands of American troops from South Korea, according to military officials familiar with the discussions, a move that could stir new anxiety among allies worried about the White House commitment to Asia.

A highly anticipated White House report on Health Secretary Robert F. Kennedy Jr.'s agenda focuses heavily on his vocal concerns about vaccines. The report also addresses his positions on environmental and nutrition issues, which at times diverge from the broader administration's policies.

Kim Jong Un’s dream of modernizing his country’s outdated naval fleet suffered a major setback after a much-touted warship crashed into the water after a botched exit from the dock.

Analysts say it is the North's biggest and most advanced warship to date and was likely built with Russian assistance.