Josh Simons, the former Makerfield MP, who stood aside for Andy Burnham, has warned that Sir Keir Starmer can expect a "rough time" on the campaign trail.The Manchester Mayor confirmed he will be running for a Labour leadership bid to "save the party" if he is catapulted back into the heart of Westminster.Mr Simons announced he would step down to pave the way for Mr Burnham to return to Parliament.The Prime Minister has publicly thrown "100 per …