Here's a good explanation of the media being blocked from the gaggle

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Spicy Spicer expanded the pool for the meeting and they didn't get picked. They're reactionary assholes.

"The pool usually includes a representative from one television network and one print outlet. In this case, four of the five major television networks -- NBC, ABC, CBS and Fox News -- were invited and attended the meeting, while only CNN was blocked. And while The New York Times was kept out, conservative media organizations Breitbart News, The Washington Times and One America News Network were also allowed in. Asked whether CNN and The New York Times were blocked because the administration was unhappy with their reporting, Spicer responded: "We had it as pool, and then we expanded it, and we added some folks to come cover it. It was my decision to expand the pool."

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The white house press 'corps' acts as a "pool". For some events, it doesn't make sense to bring in 150 reporters. So a selection or "pool" of reporters are picked and taken to the event. Their reports, pictures, video...etc is open to the whole press corp to use.
This event was a desginated "pool" even, so there only should have been a handful of reporters. Sean Spicer added a few extras because there was room, and didn't pick CNN or NYT.
So of course, CNN and NYT took it personally.
Look, we know he did it on purpose, but it's not like they were kicked out of the briefing room and barred from the white house. They just weren't invited to an event they already weren't invited too.

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