The following sentence is quoted from NBC NEWS. When being asked about the mood in the West Wing of the White House, the journalist said:
Well, in talking with some of the staff members here, you get the sense that there has been an exhale. The mood is certainly quiet. And many have not been in the offices. We expect that the president might get some more fresh air today.
What does "there has been an exhale" mean?
Update: I didn't notice that there is a mention of "the president's chief of staff got Covid" before the conversation, so Colin's answer of "everybody has been holding their breath" is definitely correct. Sorry for the confusion.