Keir Starmer faces the potential of more by-election woe after one of his MPs secured a mayoral seat.
Labour MP Tracy Brabin has tonight been elected as the first West Yorkshire mayor.
But it means Ms Brabin, a former Coronation Street star, will now have to step down from her Westminster seat of Batley and Spen.
This will spark a fresh by-election in the constituency. It comes just days after Labour's humiliating by-election defeat in Hartlepool.
Keir Starmer faces the potential of more by-election woe after one of his MPs secured a mayoral seat
The constituency, part of Labour's 'Red Wall', turned blue in Thursday's by-election as it was won by the Conservatives for the first time in the seat's 47-year history.
Labour had a nearly 4,000 majority in Hartlepool from the 2019 election.
The party holds in a 3,500 majority in Ms Brabin's seat of Bartley and Spen.