Billionaire Mark Cuban has shed more light on his reasons for distancing himself from former President Donald Trump .

Im not a Trump fan at all, he said on Wednesdays episode of the This Past Weekend podcast. Used to be, but then kind of grew out of it.

When Trump announced his bid for the White House in 2015, Cuban had called his candidacy the best thing to happen to politics in a long, long time.

Looking back at that moment on This Past Weekend, Cuban recalled how he eventually began to change his mind, citing a remark that Trump made after the Shark Tank star criticized him publicly.

What he would do is, he would write it, and then somebody would scan it, and then theyd email it to me. And so he sent me What happened? because he saw a CNN interview where I criticized him. And I literally, I told him, Im like: Youve got to start learning the issues, right? You cant just talk, Cuban said.

All these things are important, and if youre going to be president and ... youve got a chance to win, then youve got to learn this stuff. And I just never felt he made an effort to learn anything. Not just that, but anything, right? And so whenever you try to get into a conversation about details, it never worked, he continued.