An historic deal that lawmakers have been hashing out since October is purportedly at risk thanks to Donald Trump. Sen. Mike Rounds (R-SD) spoke to CNN’s Kaitlan Collins on “The Source” about how critical legislation is in danger of being killed by the former president playing pretend POTUS. “You’re hearing from the Republicans working on this that it is the best opportunity, they say, these are conservative Republican senators that it’s the best deal in decades — but moments ago, Trump posted on Truth Social essentially arguing that you shouldn’t take the deal and that even if it pushes the c…