It took a few weeks to land on his radar, but President Trump now views Veterans Affairs Sec. David Shulkin as a major problem. Trump has been telling associates he doesn't know what's happened at the VA, but he doesn't like what he's hearing and he may have to fire Shulkin if the situation further deteriorates.
The short version: After the VA's inspector general reported that Shulkin used taxpayer dollars to pay for his wife to go to Europe, the VA secretary has been telling anyone who will listen that Trump appointees in his agency are conspiring to undermine him. He started handling his own media relations because he doesn't trust the agency's communications staff.