None. There is a difference between taking measures to strengthen your office or the nation and serving as an authoritarian leader.
Fascism tends to not allow free and democratic elections in which one loses while holding an iron-clad grip on the running of the nation. I didn't realize the US ever had a dictatorial regime. And before anyone says FDR, he wasn't the sole force. Congress originates laws. That by itself removes the chances of fascism.
You'd have a tough time finding any type of authoritarian regime out there that doesn't have some sort of "legislature" that rubber-stamps the dictator's decrees.
You'd also have a tough time finding a type of authoritarian regime out there that does have some sort of "free and equal elections" that results in the loss of the "fascist" incumbent.