Prime Minister Keir Starmer has declared he will not resign, vowing to contest any leadership challenge from Greater Manchester Mayor Andy Burnham. Burnham's decisive win in a parliamentary by-election has amplified calls for Starmer's departure, with some lawmakers fearing electoral defeat. Starmer, however, defended his two-year tenure and warned against a disruptive leadership battle, while Burnham positioned his victory as a turning point for Labour.

UK Prime Minister Keir Starmer has tried to ward off an expected leadership challenge by saying he wants would-be rival Andy Burnham to play "a big role" in his Labour government.

Burnham's career has taken him parliament to the mayor's office in Greater Manchester and back again. Now, he faces his greatest political test.