I think he is both.
At one level he tells one big lie: that the press and his opponents are liars purveying false facts. This is a strategic position taken to discredit any opposition.
At another level, he is a BS artist. He doesn't care what he says about immigrants, about Sweden, or about Russia as long as it creates a stir in the political ecosystem.
The BS is easy to deal with, but I do not know how we overcome the big lie.
Sent to Boston Globe