WASHINGTON — President Donald Trump couldn’t get what he wanted from months of three-way trade talks with Canada and Mexico. So now his administration wants to pursue separate negotiations with the two U.S. neighbors to try to overhaul the 24-year-old North American Free Trade Agreement, which Trump has condemned as a job-killing disaster. Trump’s top economic adviser, Larry Kudlow, went on “Fox & Friends” on Tuesday to convey the president’s preference for dealing separately with Canada and Mexico.