At least three Republican senators have broken ranks to criticize President Trump: Nebraska’s Ben Sasse, Utah’s Mitt Romney and Maine’s Susan Collins. Senator Romney on Friday tweeted that Trump’s behavior was “wrong and appalling.” He added, “When the only American citizen President Trump singles out for China’s investigation is his political opponent in the midst of the Democratic nomination process, it strains credulity to suggest that it is anything other than politically motivated.” Trump fired back on Twitter, calling for Romney’s impeachment and calling him “pompous” and “a fool who is playing right into the hands of the Do Nothing Democrats!”