Giuliani will take it on, as he's the most credible lawyer to explain why it was a scam.As I posted a page or two back, they’ve spent $8m on donations for their legal challenges of over $200m. Won’t be long until there are class actions to get that money back.
However, as this implies that millions of his donors will suddenly see the light, it's unlikely, and I assume caveat emptor applies (probably more in this case, as a snake oil salesman can be done for false claims about the snake oil's healing powers, but Trump has actually told them where the money was going).