A star witnesses expected to testify in former President Donald Trump’s criminal hush money trial has a shaky record in court, but one expert believes there’s a way to turn his liabilities into assets. Former FBI Director Andrew McCabe appeared on CNN’s “The Situation Room” Monday evening to discuss upcoming testimony of Michael Cohen, Trump’s trusted personal attorney and fixer, who was sentenced to three-years in prison for tax evasion, lying to banks and Congress, and violating campaign finance laws. “Every witness brings a certain amount of baggage to their role at the trial and Cohen cert…