Drew Angerer/Getty Images (PHILADELPHIA) — President Joe Biden in a fiery speech on Tuesday decried Republican efforts to limit ballot access across the country as a “21st Century Jim Crow assault,” while warning Americans that the GOP push to restrict voting and “selfish” challenge of the 2020 election results were “the most significant test of our democracy since the Civil War.” His use of the bully pulpit from Philadelphia to invoke the Constitution comes as his administration wades more aggressively into the fight over ballot access at the urging of civil rights groups and Democrats as Republican-led legislatures advance new voting restrictions in places like Texas and Congress remains deadlocked over proposed legislation.