Department of Homeland Security officials have warned the White House that they may have trouble processing 50,000 refugees next year, putting additional pressure on President Donald Trump to lower the cap on refugees entering the United States to the lowest point in decades.In private meetings with White House officials in recent weeks, DHS officials have raised logistical concerns about handling 50,000 refugees in fiscal year 2018 if the president decides to maintain the cap that he imposed as part of the travel ban, according to two administration officials.One of the administration officials said the department was swamped with a backlog of asylum applications, which have skyrocketed in recent years.