Maguire had been considered a leading candidate to be nominated for the DNI post, White House aides had said. But Trump’s opinion shifted last week, after he heard from a GOP ally that the intelligence official in charge of election security, who works for Maguire, gave a classified briefing last Thursday to the House Intelligence Committee on 2020 election security.

It’s unclear what the official, Shelby Pierson, specifically said at the briefing that angered Trump, But the president erroneously believed that she had given information exclusively to Rep. Adam Schiff (D-Calif.), the committee chairman, and it would be helpful to Democrats if released publicly, the people familiar with the matter said. Schiff was the lead impeachment manager, or prosecutor, during Trump’s Senate trial over abuse of power and obstruction of Congress…

Pierson, who coordinates the intelligence community’s efforts to gather information on foreign threats to U.S. elections, spoke at a briefing held for the full committee on “election security and foreign interference in the run-up to the 2020 election,” said a committee official, who spoke on condition of anonymity to detail closed-door proceedings.