Over the past few weeks, Donald Trump has given a series of extended interviews with major news outlets, covering topics ranging from foreign policy to the economy to abortion. Those interviews have been intensely revealing. What they have shown is that Donald Trump has no idea what he is talking about on just about anything of relevance to a presidential candidate.

More than that, though, we’ve learned that Trump refuses to prepare, and will not learn even the most basic factoids, even when a topic is certain to arise during an interview. Instead, he will respond with deliberate provocations, with refusals to answer questions, by altering his “position” repeatedly, by changing the subject, and by ignoring or denying the facts of the subject at hand. He has demonstrated not only that he is a blithering know-nothing, but that he is determined to stay that way.

In the space of just three days last week, for example, Trump—who years ago described himself as “very pro-choice” but has said throughout the campaign that he is now pro-life—managed to take five different positions on abortion.