House impeachment transcripts show an internal White House struggle over Ukraine policy, with National Security Council staffers taking aim at President Trump and his political appointees.

Fiona Hill, a Russia specialist brought to the NSC in 2018 from the Brookings Institution, went to war against Gordon Sondland, U.S. ambassador to the European Union. A new diplomat, Mr. Sondland was a generous Trump campaign contributor and, like the president, is a gregarious hotelier.

Army Lt. Col. Alexander Vindman, a Pentagon detailee as the NSC’s Ukraine specialist, also targeted Mr. Sondland, accusing him of promoting a quid pro quo on Ukraine at a crucial July 10 White House meeting. The ambassador denies this.