Donald Trump's speech is fundamentally different than other national politicians':
Word choice isn’t the only way Trump differs from his presidential candidate contemporaries. Jennifer Sclafani, an associate professor at Georgetown University who studies the construction of political identity through language, said Trump is an enigma — the “anti-politician” when it comes to talking.
According to Sclafani, Trump doesn’t often [use discourse markers]. Usually, she said, he starts his answers with “I.” But when Trump does want to divert his answers, however, Sclafani says that’s where he gets tripped up.
For example, in the first debate, he was asked to explain why he once supported a liberal, single-payer health care system. He responded: “First of all, I’d like to just go back to one. In July of 2004, I came out strongly against the war with Iraq, because it was going to destabilize the Middle East. And I’m the only one on this stage that knew that and had the vision to say it.”
Trump was trying to illustrate that he has had stances contrary to the Republican party before, and that they were correct. But at the time, Sclafani said it came off “totally incoherent,” because he combined the discourse marker “first of all” with a complete change of subject.
Of course, criticizing Trump for the way he speaks is like criticizing Mussolini for having bad taste in clothing. It really only shows you one expression of a much deeper pathology.