The Republican National Committee has expanded legal challenges to voting and election procedures in key swing states since March, when presumptive nominee Donald Trump installed new party leaders with a mandate to pursue his unsubstantiated claims of widespread cheating. In Arizona, Michigan and Nevada, Republicans are seeking to force election officials to remove voters from the rolls, despite federal law limiting such actions in the months preceding an election. In another Nevada lawsuit, the RNC is seeking to block mail ballots from being counted if received after Election Day, using a legal theory that has been repeatedly rejected in other courts and would upend existing practices in many states. Critics say the challenges are legally frivolous. But the cases are dangerous nonetheless, they argue, because they are meant to further erode public confidence in elections and lay the groundwork to overturn the results if Trump loses. Read Article