Here’s the picture I’ve formed of White House Chief of Staff John Kelly, based on dozens of conversations over the past weeks with senior officials in the Trump administration.

Why it matters: In his 5 months as chief of staff, Kelly has successfully brought a measure of control to the West Wing but has failed to build deep alliances among much of the senior staff. Last night’s interview on Fox News — where he publicly undercut Trump — provoked the president’s first open break with his chief.