Senate Majority Leader Thune faces a tough decision on California's electric vehicle mandate

John Thune is facing a tough decision in the Senate that might determine whether or not California is saddled with an electric vehicle mandate in the near future.

At the end of his term, former President Joe Biden granted California an Environmental Protection Agency waiver, allowing it to implement regulations that would effectively mandate that 80% of cars be emissions-free by 2035 .

The waiver allowed California to make its own rules on auto emissions standards, rather than follow national standards.