Donald Trump has weighed in on Sir Keir Starmer’s political future as he warned it will be “tough” for him to survive as prime minister . The US president said Sir Keir, who is currently facing immense pressure to resign following the fallout of Labour’s disastrous local election results, will struggle to remain in office unless he deals with immigration and energy policy. Speaking to reporters on board Air Force One as he returned from his three-day visit to China, Mr Trump renewed his criticism of Sir Keir’s government. He has called on the UK to expand drilling in the North Sea a number of times, taking to his Truth Social platform to demand Sir Keir “‘drill, baby, drill”.…