This White House in general refuses to have anybody but shills ask questions, and the shills pass around the softballs lobbed to the current resident of the White House at the so-called press conferences.
Anybody not lobbing the proper softballs gets exorcised.
Contrast this with Nixon who - despite what you might think of him - did not pack the room with shills: I recall Dan Rather constantly after him about Watergate. Was Rather banned or ignored? No.