Former President Donald Trump’s sprawling network of ostensibly independent political groups raising money for him, much of it in service of paying legal expenses, seems to walk right up to the line of breaking the law, former prosecutor Kristy Greenberg told MSNBC’s Alex Wagner — and may in fact cross it. “Kristy, how is this legal?” asked Wagner. “How can he keep saying this one thing and doing another?” “Well, I think the big question here will be looking behind all of this as to who is coordinating it,” said Greenberg. “If Donald Trump is coordinating between his campaign and these PACs th…