

California, Colorado, Hawaii, Nevada, Oregon, Utah, Vermont, and Washington (both the state of and DC) have all-by-mail voting. I imagine some of the particulars vary slightly, but in general you get a ballot a few weeks prior along with some associated info, and then either mail it back and/or drop it off somewhere. Presumably there are in-person locations available for edge cases, but the overwhelming majority of voters in those areas do so by mail.
That’s him saying so as part of the Dissenting minority. He was outvoted by the rest of Trump’s sycophants.