Earlier tonight, the Supreme Court, in a 7-2 ruling, refused to stay a lower-court decision blocking the Postal Service's policy implementing Donald Trump's executive order intended to curb mail-in voting. I have previously written about the First Circuit ruling in this case, and about how Trump's order is a blatant assault on federalism and separation of powers.
As is often the case with "shadow docket" decisions, the majority opinion offers almost no analysis. But they do state that "[t]he Government is unlikely to succeed on the merits of its challenge to the District Court's preliminary injunction [against the USPS policy]." That indicates they believe that Trump's policy is indeed illegal, likely for reasons similar to those outlined by the district court and the First Circuit.