A judge in a rural Virginia city has ordered two officials there to certify the results of the election after they filed a lawsuit last month threatening not to certify unless they could hand-count the ballots.

Donald Trump warned of errors hitting the voting system and called it 'rigged' in an intervention which lays the ground for a challenge to the result - and the possibility he may not concede defeat.

Some malfunctioning voting machines in Texas are resulting in Democrats voting for GOP Sen. Ted Cruz instead of Democrat Beto O'Roure if they cast their ballot for a straight, party line ticket.