WASHINGTON (AP) — A national security official called in to testify before House committees on the impeachment inquiry into President Donald Trump says a diplomat specifically mentioned that the Ukrainians would have to investigate the Bidens. Lt. Col. Alexander Vindman says in testimony that there was “no ambiguity.” He says the conversation happened during a White House meeting with Ambassador Gordon Sondland, Ukrainian officials and others. Transcript of Vindman’s testimony was released Friday.