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"I remember the reaction almost verbatim. They said, 'This is a very well-written piece, wouldn't change a comma. We can't air it."
Costas says he asked why.
"We're in negotiations with the NFL for Thursday Night Football," he says he was told.
"It was at that point that I realized that this was an untenable situation for me," he says. "I knew my days there were numbered."