A bitter feud is escalating between Republican Sen. Rand Paul and Donald Trump’s top border official, injecting uncertainty into Congress’s attempt to pass the administration’s signature policy bill this month.

Paul has kept that independent streak, nevertheless. But in Trump’s first term, it didn’t seem to affect his relationship with the president. Paul was often seen as a counterweight to Sen. Lindsey Graham (R-SC) on foreign policy among Trump’s friends on Capitol Hill.

President Donald Trump viciously attacked Senator Rand Paul to his face during the 2016 Republican Primary debates, claiming that he has donated vast amounts of money to the U.S. Senator from Kentucky.

Kentucky Republican Sen. Rand Paul said he's concerned over the message that could be sent by President Donald Trump's upcoming military parade.