The sequence, which began early this year, involved the abrupt removal of the U.S. ambassador to Ukraine, the circumvention of senior officials on the National Security Council, and the suspension of hundreds of millions of dollars of aid administered by the Defense and State departments — all as key officials from these agencies struggled to piece together Giuliani’s activities from news reports.

Several officials described tense meetings on Ukraine among national security officials at the White House leading up to the president’s phone call on July 25, sessions that led some participants to fear that Trump and those close to him appeared prepared to use U.S. leverage with the new leader of Ukraine for Trump’s political gain.

As those worries intensified, some senior officials worked behind the scenes to hold off a Trump meeting or call with Ukrainian President Volodymyr Zelensky out of concern that Trump would use the conversation to press Kiev for damaging information on Trump’s potential rival in the 2020 race, former vice president Joe Biden, and Biden’s son, Hunter.

“An awful lot of people were trying to keep a meeting from happening for the reason that it would not be focused on Ukraine-U.S. relations,” one former official said, speaking on the condition of anonymity to discuss the sensitive matter.