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Charles Krauthammer weighed in on Donald Trump's shifted stance on birtherism, which he announced formally in a statement today.

Krauthammer said that Trump could have chosen to put the issue to rest in 2011, but chose not to.

"I don't think the information has changed; the politics have changed, and he wants to get this behind him," he said.

Krauthammer said he thinks today's statement was a result of campaign manager Kellyanne Conway telling him he's got to "say the words, however much it hurts" and "add a period at the end."

"I think he will stop talking about it and it will go away," he said.

He added that Trump has done so well in the polls because for the past 3 weeks he's refrained from "these distractions and eruptions."

"This was a recurrence of one, he ended it, and now he can continue his rehabilitation."

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