WASHINGTON — Vice President Kamala Harris engaged in a combative interview with Fox News on Wednesday, sparring with anchor Bret Baier on immigration and shifting policy positions while asserting that if elected, she would not represent a continuation of Joe Biden’s presidency. Harris’ interview marked her first foray onto the network, which is popular with conservative viewers, as she looked to broaden her outreach to GOP-leaning voters with less than three weeks until Election Day.