The didn’t get locked out. They simply weren’t invited to join a gaggle while several other news sites were.
Substantively, the administration is angry with CNN’s most recent fake news hit job where they reported that “Preibus approached the FBI and tried to get them to issue a statement saying that there was no truth to the NY Times story about Trump campaign people being in close contact with Russians during the election.”
You can add this to the lies that CNN tells...they were not locked out of a press conference. This was something different.
Including the press pool.