Mark was in NYC Wednesday morning and told us he's all-in for a lot of what the prez has done -- mostly with finance and business. On the other hand ... he skewered Trump for his handling of the immigration ban, and declared, "I don't think he'll last 4 years."
The Mavericks owner also implored POTUS to quit jumping on Twitter with his every thought. Watch, he tells Trump where to go. On social media.