America is nowhere near being a facist government today, but I’d say it’s reasonably accurate to say Trumps actions have been steps towards facism compared to other political ideologies.
Basic examples of authoritarianism would be him losing the last election but still refusing to participate in the RNC debates against other potential candidates. Even if he was leading in support that still circumvents the concept of democracy within the party. Another example is pushing his niece to take over RNC leadership as well so they control the party as well as the party finances. Although that’s in progress and may or may not be the final outcome. Having one person / family shift to control a party isn’t healthy for democracy. Can call it whatever you want to call it.