The letter gives the California High-Speed Rail Authority 37 days to respond before the grant funds are rescinded.

U.S. Transportation Secretary Sean Duffy on Wednesday threatened to halt all federal funding to California’s high-speed rail project, calling it a “boondoggle” with no viable path forward. Story: <a h ...

The ambitious project was initially approved by voters in 2008 with a $10 billion budget, but the new projected cost for ...