"It is well known that Donald Trump was not my choice for the Republican presidential nomination. After he became the nominee, I hoped his campaign would refrain from resentment and name-calling. It did not," Romney, the 2012 Republican presidential nominee, wrote in the opinion piece, adding that several of Trump's Cabinet appointments had been "encouraging." "But, on balance, his conduct over the past two years, particularly his actions this month, is evidence that the President has not risen to the mantle of the office," he wrote."