IMO Calibri and Times New Roman are both poor choices: they are not free. The US Government’s works are not generally subject to copyright, and IMO it’s rather obnoxious for their fonts to be restricted. Also, Calibri is specifically a Microsoft font, and maybe the government should be a bit less beholden to Microsoft.
IMO the government should pick something available under an appropriate free license or commission a new font for the purpose.
(I personally much prefer Times New Roman to Calibri for printed documents, but that’s neither here nor there.)
US Gov already has an ”official” open source typeface, Public Sans. https://public-sans.digital.gov/
Unfortunately, it’s also intended to be not just accessible, but ”principles-driven”. Can’t have that. (More seriously, it’s probably more appropriate for screens than print)