Roger Wicker

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U.S. Sen. Roger Wicker, R-Miss., speaks in support of President Trump's actions against Syria, Tuesday, April 11, 2017, during an address at a lunch sponsored by the Stennis Institute-Capitol Press Corps, in Jackson, Miss. (AP Photo/Rogelio V. Solis)

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U.S. Sen. Roger Wicker, R-Miss., speaks in support of President Trump's actions against Syria, Tuesday, April 11, 2017, during an address at a lunch sponsored by the Stennis Institute-Capitol Press Corps, in Jackson, Miss. (AP Photo/Rogelio V. Solis) ** FILE **

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U.S. Sen. Roger Wicker, R-Miss., speaks in support of President Trump's actions against Syria, Tuesday, April 11, 2017, during an address at a lunch sponsored by the Stennis Institute-Capitol Press Corps, in Jackson, Miss. (AP Photo/Rogelio V. Solis)

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U.S. Sen. Roger Wicker, R-Miss., speaks in support of President Trump's actions against Syria, Tuesday, April 11, 2017, during an address at a lunch sponsored by the Stennis Institute-Capitol Press Corps, in Jackson, Miss. (AP Photo/Rogelio V. Solis)

SEN. ROGER WICKER PHOTO

Senator Roger Wicker (R-MS)

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Senate Armed Services Committee Chairman Carl Levin (left), Michigan Democrat, and Sen. Roger Wicker, Mississippi Republican, talk on Capitol Hill in Washington on April 17, 2013, before a hearing with Defense Secretary Chuck Hagel. A letter addressed to Wicker, believed to be poisoned with ricin or a similarly toxic substance, was intercepted at a mail facility outside the capital earlier in the week. Levin issued a statement saying an aide in his Saginaw, Mich., office had also received a suspicious-looking letter. (Associated Press)

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Sen. Roger Wicker, R-Miss., (right) speaks during a news conference at the Capitol in Washington, January 2009. (Associated Press) ** FILE **

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** FILE ** Sen. Roger Wicker, R-Miss., speaks during a news conference at the Capitol in Washington, Jan., 2009. Senate Majority Leader Reid said Tuesday, April 16, 2013, that letter with ricin or another poison was sent to Wicker. (AP Photo/J. Scott Applewhite, File)