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COLUMBIA, SC - SEPTEMBER 23: Republican presidential candidate Donald Trump speaks to the media before a campaign event September 23, 2015 in Columbia, South Carolina. Earlier today, Trump tweeted 'FoxNews has been treating me very unfairly & I have therefore decided that I won't be doing any more Fox shows for the foreseeable future.' (Photo by Sean Rayford/Getty Images)

COLUMBIA, SC - SEPTEMBER 23:  Republican presidential candidate Donald Trump speaks to the media before a campaign event September 23, 2015 in Columbia, South Carolina.  Earlier today, Trump tweeted 'FoxNews has been treating me very unfairly & I have therefore decided that I won't be doing any more Fox shows for the foreseeable future.' (Photo by Sean Rayford/Getty Images)