White House national security adviser Robert O'Brien is the highest-ranking member of the Trump administration known to have contracted the virus. Evan Vucci/AP hide caption
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Former national security adviser John Bolton, seen in February, is scheduled to publish a memoir of his time with the Trump administration on June 23, and the Justice Department is trying to block publication. Mark Humphrey/AP hide caption
Health and Human Services Secretary Alex Azar testifies before a House Commerce subcommittee on Capitol Hill in Washington, on Wednesday. Azar has been leading the White House coronavirus task force. Susan Walsh/AP hide caption
Robert O'Brien's first order of business when he took over the NSC in September was to make cuts in what he saw as a bloated foreign policy wing. Nicholas Kamm/AFP via Getty Images hide caption
The House impeachment inquiry wants to hear from John Eisenberg, the top lawyer at President Trump's National Security Council, but he was instructed to stay away, Eisenberg's lawyer said. Eric Baradat/AFP via Getty Images hide caption
Tim Morrison, a key aide on the White House's National Security Council, is expected to leave his post imminently. Sarah Silbiger/Reuters hide caption