In recent days, Sen. Mitt Romney (R-Utah) has been fielding calls from GOP donors itching for him to primary President Trump in 2020, a person close to Romney told Vanity Fair. "There is a half-billion dollars on the sidelines from guys who are fed up with Trump," one donor told Vanity Fair's Gabriel Sherman. Romney has been one of the few Republican voices to speak out against Trump's attempts to get foreign leaders to investigate former Vice President Joe Biden, tweeting on Friday that his "brazen and unprecedented appeal to China and to Ukraine ... is wrong and appalling." This...