President Joe Biden is undoing several foreign policy successes of the Trump administration for no apparent reason other than radical ideology and political spite. In each case, former President Donald Trump was able to achieve goals that both parties had long claimed to share. And in each case, Biden has not only hurt the interests of the United States, but reduced the leverage that he might otherwise have had to pursue foreign policy goals unique to his administration. Three examples: Border policy: President Trump signed agreements with Central American countries that slowed the flow of migrants. In June 2019, he...