FIRST ON FOX: Republicans on the House Oversight Committee are investigating Vice President Kamala Harris’ role in dealing with the crisis at the southern border -- demanding that Customs and Border Protection (CBP) turn over any internal communications with her office on illegal immigration."The mass illegal migration under the Biden-Harris Administration has contributed to murders, sexual assaults, and serious bodily injuries committed against numerous Americans at the hands of illegal aliens," Chairman James Comer said in a letter to acting CBP Commissioner Troy Miller, obtained first by Fox News Digital."The Committee requests documents and communications to understand Vice President Harris’s