Presidents do not get to pick and choose which Americans to help at times of disaster. We are one country, and we do what we must to help fellow citizens in need. We saw it during this long, terrible hurricane season, in Puerto Rico, the Virgin Islands, Texas, Florida — strangers helping strangers, regardless of race, income, political views. We are seeing it now as firefighters from around the country converge on Northern California to attack the deadly blazes that are still burning out of control.

It is wrong to describe Trump as any kind of nationalist if he fails to grasp the most fundamental of nationalistic precepts: We leave none of our own on the battlefield.