Acting White House Chief of Staff Mick Mulvaney, pictured in the Oval Office on May 13, is one of President Trump’s closest advisers, but his negotiating tactics aren’t widely loved on Capitol Hill.

Acting White House Chief of Staff Mick Mulvaney, pictured in the Oval Office on May 13, is one of President Trump’s closest advisers, but his negotiating tactics aren’t widely loved on Capitol Hill.