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Marine Gen. James Mattis, commander, U.S. Central Command, testifies on Capitol Hill in Washington, Tuesday, March 5, 2013, before the Senate Armed Services Committee hearing to review of the Defense Authorization Request for Fiscal Year 2014 and the Future Years Defense Program. (AP Photo/Evan Vucci)
Conservative donors are throwing their weight and cash behind retired U.S. Marine Corps Gen. James Mattis in an attempt to pressure him into the presidential race to slow Donald Trump’s momentum.