A background witness in former President Donald Trump’s criminal hush money trial delivered a “devastating blow” in his testimony Tuesday, according to a trial lawyer watching the case. Former National Enquirer publisher David Pecker took the stand in Manhattan’s criminal court to detail stories cooked up to damage Trump’s political rivals during his 2016 presidential campaign and, in doing so, did significant damage to Trump’s defense, argued criminal defense attorney Stacy Schneider. “This is a very strategic on the part of the prosecution,” Schneider said on a CNN panel. “David Pecker, who …