A top official at the Pentagon has been asked for his resignation, according to reports. John Rood, the undersecretary of defense for policy, has lost the support of senior national security leadership and has been asked to step down, a source familiar with the matter told CNN on Wednesday. Rood was involved in certifying to Congress that Ukraine was eligible to receive $250 million in security assistance. The certification undercut the argument the Trump administration made for withholding the aid. Shortly after President Trump spoke with Ukrainian President Volodymyr Zelensky on July 25, Rood emailed Secretary of Defense Mark Esper...