Material Support....for what?

If Mahmoud has committed a crime, like "material support for terrorism" then he needs to be charged. Yet the WH says he hasnt committed a crime

Martin: "A White House official told the Free Press that there's no allegation that he broke any laws. So, again, I have to ask, what specifically constitutes terrorist activity that he was supporting? What exactly do you say he did?".... How did he support Hamas? Exactly what did he do?

Edgar: Well, I think you can see it on TV, right? This is somebody that we've invited and allowed the student to come into the country, and he's put himself in the middle of the process of basically pro-Palestinian activity. And at this point, like I said, the Secretary of State can review his visa process at any point and revoke it.