And Trump has spent much time in the days following the debate answering questions about the hiring of Polish workers 35 years ago and his upcoming lawsuit defending Trump University.
Trump's rivals seem to know by now that to have a chance in the primary -- or in the general election -- sitting back and waiting for the perfect opportunity to strike hasn't been a winning strategy. Punching back at any reasonable opportunity could be.
You're in a poker tournament, at the final table of ten players. One of them is a loose-aggressive bully who is quickly amassing chips and eliminating rivals. If you just wait, you think, until it's down to just the two of you, then you'll take him on -- and win. Even if you should get to that point, one problem with this strategy is that by the time you do, your opponent is likely to have so many more chips than you, that winning in the end is a long shot.
Rubio bullied the bully. Two things happen at the poker table when you do that. First, other players see that the LAG can be beaten, and some may be emboldened to use a similar strategy. Second, the LAG knows this, and will often quickly move to reestablish dominance. Trump has done that time and again in this election when he's been attacked.