The result could be a near doubling of refugees entering the country, from about 830 people a week in the first three weeks of this month to well over 1,500 people per week by next month, according to refugee advocates. Tens of thousands of refugees are waiting to come to the United States.

The State Department’s decision was conveyed in an email on Thursday to the private agencies in countries around the world that help refugees manage the nearly two-year application process needed to enter the United States…

While 13,255 refugees were admitted in August, that number plunged to just 2,070 in March. So far during the 2017 fiscal year, 45,732 people have been admitted, just a few thousand short of Mr. Trump’s proposed cap.

Refugee groups now predict that entries into the United States could increase so rapidly that the total number of refugees admitted by Sept. 30, the end of the fiscal year, could exceed 70,000. That is well below the 84,994 refugees admitted in fiscal year 2016, but not by nearly as much as many advocates had feared.