US Army officer says he heard Donald Trump-Volodymyr Zelenskiy call, raised concerns over US president seeking 'favour' from Ukraine
• .Alexander Vindman, a lieutenant colonel who served in Iraq and, later, as a diplomat, is prepared to tell House investigators that he listened to US president Donald Trump's 25 July call with new Ukraine president Volodymyr Zelenskiy and reported his concerns to the NSC's lead counsel, according to prepared testimony
