Harry Enten for CNN:
Numerous Republican state legislatures are trying to pass new voter restriction legislation (e.g. limiting absentee and early voting). Meanwhile, Democrats in Congress are trying to pass laws that expand access to the ballot box.
But we should be clear: high turnout had little to do with why Trump ended up being a one-term president. Trump lost because he was an unusually unpopular president, and he likely would have been defeated if turnout looked like it did in 2016.