It's unclear whether a former campaign aide to Donald Trump will cooperate with the Special Counsel's ongoing Russia probe.
During a number of erratic live media appearances, Sam Nunberg, who was fired by the Trump campaign in 2015, said he would resist a subpoena Robert Mueller to appear before a grand jury.
But as John Clarke reports from Washington, Nunberg might be having second thoughts...
IN: "Nunberg has been summoned...
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