Masks won't protect you (unless you use medical masks, and also know HOW to use them, and the latter is really a problem, I've seen more people using them the wrong way than the right way, to be honest, and then you need more than just a mask)... But the way Trump went onto campaign in general, with many many people in large large groups, plus Trump is 70+ years old, said to be overweight, those kinds of factors play a role in the risks you take... Of course the First Lady is younger, but when you keep your wife close she could only be bound to get infected as well...
Just having a "told you so" is not really well here... You can never tell how he got himself infected....
What worries me, though is how the elections will go next. And especially, what will happen if the virus kills Trump (he doesn't seem that bad, but you never know)... On the news I have now on in the background they tell me that doesn't mean that Pence replaces Trump as new candidate, and the elections are less than a month away. Should the Republicans win the election things can go very strange if Trump doesn't make it. And you cannot tell if Biden is really not infected (there is 2 weeks between infection and the first symptoms after all, and only after those weeks you can be tested positive)... If in 2 weeks Biden is tested positive as well, things can really go crazy....