The president and vice president both declined face-to-face meetings this week with the prime minister of Iraq's Kurdish region, Masrour Barzani, a U.S. ally who has served as a bulwark against Iranian efforts to infiltrate Iraq, according to sources familiar with the matter. Barzani is in Washington, D.C., this week for a series of high-level meetings with U.S. officials at a time when Iranian terrorist proxies are running rampant across Iraq a…