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DAVOS, Switzerland:  US Robert Mueller, Director of the Federal Bureau of Investigation (FBI) attends the session "Security is an Always-on World" at the World Economic Forum in Davos 26 January 2006.Tthe World Economic Forum this year is gathering more than 2,300 leaders, officials and executives for five days of high-powered networking.  AFP PHOTO PIERRE VERDY  (Photo credit should read PIERRE VERDY/AFP/Getty Images)

NEW YORK, NY - NOVEMBER 03:  Donald Trump attends a press conference for the release of his new book "Crippled America" at Trump Tower on November 3, 2015 in New York City.  (Photo by Noam Galai/WireImage)
DAVOS, Switzerland:  US Robert Mueller, Director of the Federal Bureau of Investigation (FBI) attends the session "Security is an Always-on World" at the World Economic Forum in Davos 26 January 2006.Tthe World Economic Forum this year is gathering more than 2,300 leaders, officials and executives for five days of high-powered networking.  AFP PHOTO PIERRE VERDY  (Photo credit should read PIERRE VERDY/AFP/Getty Images)

NEW YORK, NY - NOVEMBER 03:  Donald Trump attends a press conference for the release of his new book "Crippled America" at Trump Tower on November 3, 2015 in New York City.  (Photo by Noam Galai/WireImage)

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    Mueller subpoenas Trump Org. in Russia probe

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Mueller subpoenas Trump Org. in Russia probe

Special counsel Robert Mueller has subpoenaed the Trump Organization for documents, including some related to Russia. CNN's Pamela Brown reports.

Mueller subpoenas Trump Org. in Russia probe

Special counsel Robert Mueller has subpoenaed the Trump Organization for documents, including some related to Russia. CNN's Pamela Brown reports.