https://www.nytimes.com/2019/10/23/us/politics/ukraine-aid-freeze-impeachment.html
Following testimony by William B. Taylor Jr., the top United States diplomat in Ukraine, to House impeachment investigators on Tuesday that the freezing of the aid was directly linked to Mr. Trump’s demand for the investigations, the president took to Twitter on Wednesday morning to approvingly quote a Republican member of Congress saying neither Mr. Taylor nor any other witness had “provided testimony that the Ukrainians were aware that military aid was being withheld.”
But in fact, word of the aid freeze had gotten to high-level Ukrainian officials by the first week in August, according to interviews and documents obtained by The New York Times.
The problem was not a bureaucratic glitch, the Ukrainians were told then. To address it, they were advised, they should reach out to Mick Mulvaney, the acting White House chief of staff, according to the interviews and records.