Mike Waltz invited The Atlantic journalist to the signal group chat, which means he probably had his phone number saved in his contacts. There’s no way Trump trusted Waltz after that, and probably thought Waltz was not loyal, going behind his back talking to journalists, which was the death knell for Waltz. As long as Hegseth proves and maintains his loyalty to Trump, he can keep fucking up. Loyalty is more important to Trump than competence.