WASHINGTON — President Donald Trump briskly overruled congressional Republicans and his own treasury secretary Wednesday to cut a deal with Democrats to keep the government operating and raise America’s debt limit. The immediate goal was ensuring money for hurricane relief, but in the process the president brazenly rolled his own party’s leaders. In deal-making mode, Trump sided with the Democratic leaders — “Chuck and Nancy,” as he amiably referred later to Senate Minority Leader Chuck Schumer and House Minority Leader Nancy Pelosi — as they pushed for the three-month deal, brushing aside the urgings of GOP leaders and Treasury Secretary Steven Mnuchin for a much longer extension to the debt limit.