Donald Trump has said the US will investigate a conspiracy theory surrounding the coronavirus suggesting it originated in a laboratory in Wuhan, China, and was originally intended as a weapon for use in biological warfare, with secretary of state Mike Pompeo urging Beijing to "come clean" on the matter.?

While the president was triggering a new constitutional crisis by threatening to adjourn Congress on Wednesday over a minor political grievance, his supporters were staging protests across the country against ongoing stay-at-home orders, with armed demonstrators chanting "Lock her up!" outside the offices of Michigan governor Gretchen Whitmer.

After teasing out the release of a set of "guidelines" for state and local government to begin reopening during the pandemic, the president unveiled his MAGA-referencing "Opening Up America Again" plan, which he said could allow some states to begin reopening "literally tomorrow" despite criticisms that the plan doesn't offer any worker protections or consistent enforcement to prevent a spike in outbreaks.

He said his guidelines offer a "phased, deliberate approach" for states to re-open businesses, after the president has grown impatient with a stalled economy in the wake of the pandemic.

Mr Trump said "a national shutdown is not a sustainable long-term solution."