Have you seen any data that indicates that the number of mass shooting are higher under demon-crat admins? I feel as if that is true... but don’t have raw daw.
It's worth a look. It may just be Press Bias, and the reporting they choose.
The research into mass shootings is greatly altered by the definition one chooses for a mass shooting. Here is just a smattering of those definitions.
BTW, based on some of the more loose definitions, 2019 was (in December of 2019) noted as a peak year. That was under Trump, of course.