Trump’s been telling some dangerous whoppers, according to his own former White House attorney. Ty Cobb during an appearance on CNN’s “Erin Burnett OutFront” remained confident that prosecutors would turn his former client into a punching bag for all the lying should he take the witness stand and testify. “I’m not sure he will testify,” Cobb said. “I’d say it’s still 50-50 because as the lawyer in me says, you know, ‘Why put him on?'” POLL: Should Trump be allowed to run for office? Cobb continued: “He’s going to be subject to an eviscerating cross-examination which won’t focus on what Trump w…