The White House will decide which media outlets participate in the presidential press pool, it announced Tuesday in a break from a century of tradition in which the White House Correspondents’ Association,

The White House said on Tuesday it would decide which media organizations participate in the press pool that covers the president, wresting control away from the group of journalists that has done so for decades.

This week is a troubling turning point in the already-tense dynamic between the Trump White House and the press corps.