The justices rejected an appeals court's requirement that members of majority groups meet a heightened standard to win employment discrimination cases.
The executive order is the latest effort by President Trump to stoke outlandish conspiracy theories about his predecessor and question the legality of his actions in office.
In a coming book, Karine Jean-Pierre will describe a "betrayal" by her party when Joseph R. Biden Jr. ended his re-election campaign. Democrats were quick to criticize her.
The sprawling legislation carrying President Trump's domestic agenda squeaked through the House with one vote to spare, but some Republicans now say they didn't realize what they voted for.