By Mica Rosenberg (Reuters) -A Texas county sheriff is opening a criminal investigation into flights that carried dozens of migrants to Martha’s Vineyard, Massachusetts, from Texas last week, an act that Florida’s Republican governor took credit for and which the White House dubbed a political stunt. Bexar County Sheriff Javier Salazar said at a news conference on Monday that around 50 migrants were “lured under false pretences” on the streets of San Antonio, put up in a hotel, bused to planes and “stranded unceremoniously in Martha’s Vineyard,” a wealthy vacation island, “for nothing other th…