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... Republican National Convention delegates erupted in applause last month when Texas Gov. Greg Abbott doubled down on his commitment to send buses full of migrants to blue cities.

"We have continued busing migrants to sanctuary cities all across the country," Abbott told the cheering crowd in Milwaukee. "Those buses will continue to roll until we finally secure our border."

But the buses have not been rolling on a consistent basis for months because of a steep drop in the number of migrants apprehended at the southern border, according to officials and migrant shelter operators in Texas and in a half-dozen big cities across the U.S. ...