Lawmakers and the public have heard testimony from current and former officials that military aid was withheld from Ukraine and that a White House meeting with Ukrainian President Volodymyr Zelenskiy was conditioned on Kiev probing Biden and his son Hunter as well as a debunked conspiracy theory about Ukraine interference in the 2016 U.S. election.
U.S. Under Secretary of State for Political Affairs David Hale, the No. 3 State Department official, told a Senate Foreign Relations Committee hearing on Tuesday that he had seen no evidence that Ukraine - not Russia - interfered in the 2016 elections, undermining an argument used by Trump and some of his supporters.
An investigation by the Republican-controlled Senate Intelligence Committee also could not substantiate allegations of Ukraine's interference, two congressional sources said on condition of anonymity.