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WASHINGTON, DC - JUNE 01:  Senior Counselor to the President Steve Bannon helps with last minute preparations before President Donald Trump announces his decision to pull out of the Paris climate agreement at the White House June 1, 2017 in Washington, DC. Trump pledged on the campaign trail to withdraw from the accord, which former President Barack Obama and the leaders of 194 other countries signed in 2015 to deal with greenhouse gas emissions mitigation, adaptation and finance so to limit global warming to a manageable level.  (Photo by Chip Somodevilla/Getty Images)
WASHINGTON, DC - JUNE 01:  Senior Counselor to the President Steve Bannon helps with last minute preparations before President Donald Trump announces his decision to pull out of the Paris climate agreement at the White House June 1, 2017 in Washington, DC. Trump pledged on the campaign trail to withdraw from the accord, which former President Barack Obama and the leaders of 194 other countries signed in 2015 to deal with greenhouse gas emissions mitigation, adaptation and finance so to limit global warming to a manageable level.  (Photo by Chip Somodevilla/Getty Images)

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A self-described 'email prankster' seemingly fooled top editors at Breitbart over the weekend into believing he was Steve Bannon. Jake Tapper reports.

Breitbart editor pledges to do 'dirty work' for Bannon

A self-described 'email prankster' seemingly fooled top editors at Breitbart over the weekend into believing he was Steve Bannon. Jake Tapper reports.