Honestly I would like to know why a term that belongs to the political history of an European country is misused, today, in the United States to portray a Conservative politician who just wants to make America great again, by the means of protectionism, tax reductions and less war campaigns.
There are no fascist leaders in the US, and there will never be.
It might depend on how people perceive fascism. Of course, I'm aware that "fascism" is a term that originated in Italy and is probably more relevant to Italian politics than anything else. But the characteristics and traits of fascism might be identified in other countries, governments, and political parties or factions.
I think a key question would be is if one considers the pre-history and origins of the U.S. to be fascist, as well as the early history in the 18th and 19th centuries, prior to the Civil War. We did have some aspects that might be considered fascist. Suffrage was limited only to white males who owned property. There was slavery. The government was very expansionistic, believing that aggressive invasion and force were legitimate means of acquiring territory. It was white supremacist in every sense of the term.
But it was never a dictatorship, and it was far more decentralized with a separation of powers which would not have been conducive to anything resembling 20th century European fascism. That was a major issue - the strong resistance to having any kind of strong, central government - which would be essential for any would-be fascist leader to be able to consolidate power. By decentralizing power among the several states, that was seen as a preventative measure against all power being concentrated within a single ruler, party, or city.
That issue was partly settled as a result of the Civil War, at least in the sense that slavery had ended and US citizenship and voting rights were codified by the Reconstruction Amendments. But that aside, one might still see the same fascistic elements, but it's also when America's perception was more singular and unified. Before the Civil War, people would say "The United States are...," but after the Civil War, it was "The United States is..." Patriotism and national unity and reconciliation were emphasized, which also had nationalistic and xenophobic elements. And it was still very racist, both in terms of public policy and the overall culture. We were still expansionistic, and this also began a more aggressive period of imperialism in Latin America and the Pacific. With the large influx of immigrants to the U.S., there was also a push towards assimilation, which might be seen as having racist and/or fascistic motives. Women didn't get to vote until 1920 (although some states allowed women to vote sooner).
These and other aspects of that period might be considered to be characteristics in common with that of a fascist state, so I can see where someone might make a case for that. Even later on in our history, during the time of the Cold War, McCarthyism, J. Edgar Hoover, Nixon, Kissinger, Reagan, one might look back and wonder.
As I said, we've never had a bona fide "dictatorship," and power still remains somewhat decentralized, although perhaps not as much as some people would like.
I would say that a major problem - and why fascism can even be seen as a possibility in America - is because too much discretionary power was granted to the Chief Executive (and by extension, the Executive Branch), mainly because of the fears which came about during the Cold War and the various Red Scares. That's when the "Imperial Presidency" was born.
In other words, we gave too much power to the Presidency because we were afraid of an idea, and now it may come to bite us in the backside. In my view, the solution should be to reduce the powers granted to a single individual. There needs to be more checks and balances and a division of power in the Executive Branch. If we don't want a dictator, then we should not have a government where all power and the entire apparatus are under the stewardship of one person.