The undercutting follows a familiar sequence: a Trump official is sent in front of the media to give a message – then Trump swoops in and says the opposite

HR McMaster and White House press secretary Sean Spicer field questions from reporters during a press briefing at the White House Tuesday in Washington DC.
HR McMaster and the White House press secretary, Sean Spicer, field questions from reporters during a press briefing at the White House Tuesday in Washington DC. Photograph: Win McNamee/Getty Images