It means that he dismissed the temporary attorney general from her job. To fire = to dismiss a person from their job Acting in this context means someone who is working in a position temporarily until they are declared in the permanent position or until a more suitable person is appointed. AG = attorney general

AG = Attorney General; 被炒魷魚了

Greetings, It means President Trump fired(remove from the job) his acting attorney general on Monday night, removing her as the nation’s top law enforcement officer after she defiantly(disregarded) refused to defend his executive order closing the nation’s borders to refugees and people from predominantly Muslim countries. Hope it helps Regards, Deepika mantra

You're fired !!

Trump fired acting Attorney General: The person in charge of the United States Department of Justice, the highest ranking law enforcement officer and lawyer in the U.S.