Impeachment: Ex-Pompeo aide arrives on Capitol Hill to testify in Ukraine probe

P. Michael McKinley testifiesP. Michael McKinley, former senior adviser to Secretary of State Mike Pompeo, arrived on Capitol Hill Wednesday morning to testify before the House Democrats' impeachment panel.

McKinley resigned from his post just last week, after a career that spanned decades and included posts as U.S. ambassador to Brazil and Afghanistan.

The timing of McKinley's departure raised questions about Pompeo's role in the Ukraine controversy, particularly his refusal to stand up for career diplomats who felt sidelined and smeared by Rudy Giuliani, President Donald Trump's personal lawyer.

Giuliani targeted the former U.S. ambassador to Ukraine, Marie Yovanovitch, as he pressed the Ukrainian government to launch politically tinged investigations that could have helped Trump's re-election campaign. Trump yanked Yovanovitch from the ambassador's job before her tenure was up, and critics have blamed Pompeo for not defending her.