No way.

[Wiktionary](https://en.wiktionary.org/wiki/establishment) defines
"the Establishment" as the ruling class or authority group in society;
especially, an entrenched authority dedicated to preserving the status
quo.

Arguably, before Donald Trump became president he was part of the
Establishment because he was a billionaire. Therefore he wielded a lot
of authority. But during his election campaign it became clear that in
some way he was also outside of the Establishment and especially not
part of the Republican party's inner circle.

But then he won the election and became the president of the United
States. It would, in my mind, be absurd to not consider the president
of the United States part of the Establishment. Therefore Donald Trump
is now part of the Establishment. But his supporters have not
abandoned him so how could they ever be anti-Establishment?

Communists dream of a revolution. In the revolution, the Establishment
will be replaced with a new Socialist one. They are against the
Establishment. But they can only be against the Establishment as long
as they keep failing because if they succeed, the Communists themselves
become part of the Establishment.

Perhaps the only true anti-Establishment ideology is
Anarchism. Anarchists want a revolution like the Communists, but
unlike them, they do not want to replace the Establishment with a new
one. I don't see how it could ever work out in practice, but
Anarchists believe it will.

However, I think that Donald Trump, UKIP and a lot of other political
groups can be characterized by something else. Namely the
black-and-white world view. Either you are against us or you are with
us. They believe that most of the establishment consists of persons
who are enemies. But that is orthogonal to being against the
establishment itself.