Trump’s success in getting Mexico to agree to do more to curb the flow of illegal immigrants through their country and into the United States should be receiving universal praise, but unfortunately, Democrats, who we all know want to see illegal immigration increase to help secure their party’s power in government, couldn’t concede that Trump’s plan worked. House Speaker Nancy Pelosi called Trump’s tariff threat, which succeeded in its goal, a counterproductive exercise in “threats and temper tantrums.” “President Trump undermined America’s preeminent leadership role in the world by recklessly threatening to impose tariffs on our close friend and neighbor...