What does this sentence say exactly?

It's trying to shift blame from the Republican President and onto an unnamed horde of everyone but no one for the catastrophically poor and fatally disastrous response by federal agencies, every one of which the President leads, that resulted in thousands and thousands of avoidable American deaths. 

Since Bush and Trump are each 100% responsible for all the failures of the federal government's response in each case, what with all federal agencies being members of the Executive Branch and working "at the pleasure of the President," the President being the head of the Executive Branch, it actually is true that Trump is no more to blame that Bush, but not because there's plenty of blame to go around, like that sentence says, but because there's no more than being 100% to blame, thus making them tied at 100% to blame.