Fiona Hill and David Holmes will testify before the House Intelligence Committee starting at 9 a.m. Follow live updates here:
Hill is a former National Security Council official who raised concerns about Rudy Giuliani and efforts to pressure Ukraine.
Holmes is a diplomat at the U.S. embassy in Kiev, who overheard EU Ambassador Gordon Sondland discussing investigations with President Trump the day after his July 25 call with the president of Ukraine.
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