Mitt Romney made an unsuccessful effort to recruit Nebraska Sen. Ben Sasse as a third-party presidential candidate to challenge Donald Trump and Hillary Clinton, a source with knowledge of the efforts confirmed to CNN Sunday. Sasse, the freshman Republican, has emerged as one of Trump's foremost critics from the right. Romney and Sasse have talked, the source said, and Romney encouraged Sasse to seriously consider a run... But Sasse is refusing to enter the race... At the Nebraska GOP convention, Sasse was rebuked through a resolution that was overwhelmingly approved by Republicans there who argued that his position would only...