evidence: Ex-McCain, Bush and Romney staffers endorse Biden, joining Republicans bucking Trump Republican aides who worked in the George W. Bush administration and for the late Senator John McCain and Mitt Romney vouched their support for 2020 Democratic nominee Joe Biden on Thursday, joining other GOP officials in rejecting President Trump's reelection campaign on the final day of the Republican National Convention. In separate letters released Thursday, alumni of the Bush administration, Utah Senator Mitt Romney's 2012 presidential campaign and McCain's 2008 White House bid and congressional office announced their support for the former vice president. The Republican officials said that while they disagree with some of Biden's policy positions, they value his record of bipartisan work and believe he can offer steady leadership as the country grapples with the coronavirus pandemic, a weakened economy and deeply entrenched political divisions.