James Mattis accuses Trump of abusing his powers in an op-ed New York Post James Mattis Denounces President Trump, Describes Him as a Threat to the Constitution The AtlanticJames Mattis denounces Trump's leadership in scathing statement Fox NewsREAD: Former Defense Secretary Mattis' statement on Trump and protests CNNFormer Defense Secretary Mattis breaks silence and tears into Trump: 'He tries to divide us' CNBCView Full Coverage on Google News