"In matters that relate to the divisiveness of our political environment, I'll speak out if I feel the need to, if there's something significant, and I think it's important as I begin this new job to make it very clear where I stand," Romney said on CNN, adding that he backs the president's attempt to secure funding for a border wall but feels compelled to criticize him on issues ranging from Trump's comments on race and women to the "abrupt" way he believes the president is conducting U.S. foreign policy.