I’m told Trump was embarrassed by the coverage of Zacharia’s briefing and when he polled other aides about her, Zacharia had few allies willing to stand up for her or defend her performance. The main reason he rushed to select her after growing irritated with how long the process was taking to replace Karoline Leavitt was because he wanted more people defending him on TV. When she failed to do so in a sufficient way with Sean Hannity, Trump said he knew she needed to go.