They had more legislative leverage prior to 2018, so they could have done all this much earlier.
It is not possible to honestly discuss this in a meaningful way without acknowledging it's 3 months out from a presidential election. It the closest thing they can legally do to suppress voting turnout, and it's a deliberate strategy to win the election by reducing the franchise.
This isn't in a vacuum either, it's a coordinated part of a national legislative strategy (https://www.theatlantic.com/politics/archive/2012/04/exposin...). It is coordinated across at the state and federal levels, and across branches. You can see here with the intentional degrading of the USPS immediately prior to a national election, at a state level with polling place closures (https://www.reuters.com/article/us-usa-election-locations/so...) and photo id laws (https://www.aclu.org/other/oppose-voter-id-legislation-fact-...), and constellation of Republican judicial appointments coordinated with specially prepared and crafted legal challenges by Republican AGs and private parties at state and circuit levels.
This is how it's being done: https://www.washingtonpost.com/graphics/2019/investigations/...