The Ukraine impeachment inquiry has created the first rift between President Donald Trump and the Cabinet member who has been his closest ally, Secretary of State Mike Pompeo, according to four current and former senior administration officials.

Trump has fumed for weeks that Pompeo is responsible for hiring State Department officials whose congressional testimony threatens to bring down his presidency, the officials said. The president confronted Pompeo about the officials — and what he believed was a lackluster effort by the secretary of state to block their testimony — during lunch at the White House on Oct. 29, those familiar with the matter said.

Read the rest of the story at NBC News.