PoliticoMullen: Trump's rhetoric on North Korea 'has taken away options'PoliticoRetired Adm. Mike Mullen, a former chairman of the Joint Chiefs of Staff, said Saturday that he is “extremely concerned” about the situation in North Korea in part because escalating rhetoric from President Donald Trump “has taken away options” for ...Mullen Expresses Concern Over 'Brinkmanship' With North KoreaNPRUS general, S.