U.S. officials are defending pulling all U.S. troops out of Afghanistan despite Americans remaining in the country, breaking a promise from President Joe Biden. “We continue our mission to get them out. It’s just that it has shifted from a military mission to a diplomatic mission,” national security adviser Jake Sullivan said Tuesday on ABC’s “Good Morning America.” “And we have considerable leverage over the Taliban to ensure that any remaining American citizen will be able to get out,” he added, without describing the leverage. Between 100 and 200 Americans are still in Afghanistan, according to State Department estimates. Biden, who plans to speak on Afghanistan later Tuesday, promised on Aug. 20 that the United States would evacuate every American who wanted to leave the country. But at least some of the Americans who remain in the Taliban-held country said they tried to leave but were not successful. “The last flight …