President Biden has vetoed legislation that would have rolled back a new rule limiting emissions from heavy-duty vehicles. The White House says the rule change will cut nitrogen oxide emissions in half by 2045, preventing thousands of childhood asthma cases and premature deaths every year. The bill to repeal the tougher emissions cleared the Senate in April with the support of Democratic Senator Joe Manchin of West Virginia, and with ailing California Senator Dianne Feinstein absent.