McKinley will outline how his concerns culminated with the recall of the U.S. ambassador to Ukraine, Marie Yovanovitch, a punitive action he and many other rank-and-file diplomats viewed as wholly unjustified.

“The unwillingness of State Department leadership to defend Yovanovitch or interfere with an obviously partisan effort to intervene in our relationship with Ukraine for the political benefit of the president was too much for him,” said the person, who spoke on the condition of anonymity to be candid…

The person familiar with McKinley’s statement said the veteran diplomat will not criticize Pompeo directly, though he will discuss his concern over the politicization of the agency in the Trump administration.