“With this president, you never know.”

That’s a sentence I’ve heard several times as I’ve covered Donald Trump’s first 100 days in the Oval Office—not from pundits or journalists or members of Congress, but from a high-ranking White House aide. That feeling of uncertainty permeates the West Wing and the entire administration, on everything from policy to personnel. Decisions are often made at the last minute, and the results are sloppy or half-finished. Aides find themselves scrambling to respond coherently to presidential tweets or promises he makes in interviews with the media. With several unfilled positions in the White House and departments and agencies, staff feel stretched thin. Lawmakers remain unsure about administration policies.