But we do, in fact, have enough information to call Trump a fascist (and thus anyone who is a suporter of his). The defintion of fascism, as stated by wikipedia is:

• far-right, authoritarian, and ultranationalist political ideology and movement.
• characterized by a dictatorial leader, centralized autocracy, militarism, forcible suppression of opposition
• belief in a natural social hierarchy, subordination of individual interests for the perceived interest of the nation or race
• strong regimentation of society and the economy.
• Opposed to communism, democracy, liberalism, pluralism, and socialism

Trump has, in the not so distant past:

• Claimed expanded executive authority
• refused to transfer power after losing an election
• has praised authoriterian leaders
• Frequently made appeals to racial and cultural superiority (e.g., calling certain countries “shitholes,” claiming immigrants are “poisoning the blood” of 'America')
• Attempted to delegitimize dissent or protest as unpatriotic
• Just a couple of days ago called the national guard (not sure if that's the correct translation) on anti-deportation protesters
• Has, and is, sending deported people into de-facto concentration camps
• Has suggested using the military for domestic policing
• Has endorsed populist economic nationalism (tariffs, breaking international trade norms, attacking corporations that oppose him)

And much more, but let's just jump to a conclusion anyways, right? Nazwałbym Pana debilem, ale tak nie wypada, to tego nie zrobę.