Postal Service warns states across US about mail voting

Mail-in primary election ballots are processed May 28 at the Chester County Voter Services office in West Chester, Pa. Gov. (AP Photo/Matt Rourke, File)

WASHINGTON — The U.S. Postal Service is warning states coast to coast that it cannot guarantee all ballots cast by mail for the November election will arrive in time to be counted, even if mailed by state deadlines, raising the possibility that millions of voters could be disenfranchised.