evidence: After years of claiming mail-in voting is rife with fraud, some Republicans – including former President Donald Trump – are working to reverse course ahead of next year’s consequential presidential and congressional elections. [...] Multiple allies had warned Trump that Democrats had an infrastructure in place and that bad-mouthing mail-in voting would put Republicans at a disadvantage, but he doubled down on his claims of rigged elections and massive fraud. [...] Stewart of MIT said some Republicans have left "a very powerful set of tools on the table" for some time by not encouraging mail-in voting. At the same time, a chorus of conservative grassroots activists have demanded in-person voting on a single day and other changes to election procedures, echoing the distrust of the system voiced by Trump and others who claim the 2020 election was stolen.