Results of last week's U.S. midterm elections were mixed, leaving a chasm in the U.S. political landscape.

The Republicans not only retained control of the Senate, but also gained more seats. The Democrats, meanwhile, took back the House of Representatives.

But in terms of American foreign policy, a veteran New York Times columnist who was recently in Japan says that the election results are unlikely to affect President Donald Trump so much, and that he is likely to keep challenging Japan and China — especially on trade issues.