Sen. Rand Paul (Ky.) said on Monday that he will oppose President Trump's attorney general nominee, becoming the first Republican to come out as a "no" vote on William Barr. Paul told Politico that he had concerns about Barr's record on privacy, calling him a "chief advocate for warrantless surveillance of U.S. citizens." A spokesman for Paul didn't immediately respond to a request for comment. The libertarian-leaning GOP senator had previously raised concerns about Barr, who also served as attorney general to President George H.W. Bush.