So, giving this race some thought... and seeing how weak Trump is running this (fake) campaign... I imagine Cruz or Rubio would have pounded Clinton on this Clinton Foundation news. Every single opportunity that presents itself would have ad money spent on it, and fill the airwaves.
There were three situations over the weekend that were bad for Clinton... and Trump capitalized on none of them. It's absolutely inexplicable.
People that actually wanted to win, and be President... such as Cruz/Rubio/Paul/etc... I just can't imagine they would have squandered such amazing opportunities. Trump continues to behave like a person that isn't actually trying to be President. He's dropping efforts in extremely important swing states... and campaigning in the deep red states of Mississippi and Texas for some reason.
Someone explain this strategy without saying "he's waiting until later"... because that's just a baseless hope... the only hope left that anyone could possibly fathom for this behavior. In short, he's acting like a guy that donated to the Clinton Foundation.
Trump calls for special prosecutor to investigate Clinton Foundation
Donald Trump: Clinton Foundation 'Must be Shut Down' - Breitbart
Don't worry, he's got this.
He is just following the strategy that defeated 16 opponents, including your much touted Rubio, and Cruz.