Stephen Hawking says he fears he “may not be welcome” in the United States during the Trump administration’s time in the Oval Office, due to their contradicting beliefs on climate change. Speaking on ITV’s Good Morning Britain with television host Piers Morgan on Monday, March 20, the eminent physicist expressed his concern over Trump’s policy and added that Scott Pruitt — the head of the US Environmental Protection Agency, and avowed climate change doubter — should be replaced.