President Donald Trump brought crypto stablecoins to the forefront of efforts to preserve the dollar’s global supremacy, firmly aligning the US government’s interests with those of issuers like Tether Holdings Ltd. and Circle Internet Financial Ltd. Trump on Thursday signed an executive order to protect the dollar, “including through actions to promote the development and growth of lawful and legitimate dollar-backed stablecoins worldwide.” At the same time, he barred any further work on a centr...