evidence: As Election Day nears and a parade of anti-Trump Republicans announce their support for Vice President Kamala Harris, one prominent GOP Trump critic has withheld his endorsement: Sen. Mitt Romney (R-Utah), one of the rare anti-Trump Republicans who still holds elected office. [...] Romney has questioned the value and impact of his endorsement and expressed a desire to preserve his ability to rebuild the Republican Party in a post-Trump world, said three people familiar with those conversations and his thinking who spoke on the condition of anonymity to discuss private deliberations. [...] In the Atlantic interview, Romney cited his discomfort with Biden’s policies as one of the barriers to endorsing the sitting president, who dropped out of the race in July.