How will Burnham deal with Trump?

Overnight, President Trump offered his first sliver of a thought on the incoming prime minister Andy Burnham. Calling him "a liberal … and a mayor of some town" - which, arguably, could have been much worse. Does Burnham need to put his relationship with Trump centre stage? Or just ignore him? Will Trump be as relevant to Burnham as he was to Starmer? Later: has the water closed over the Starmer premiership without a ripple? Why have we moved on so quickly? Are we in danger of turning the office of prime minister into a pop-up shop?