During the 2016 campaign, Trump made it clear that illegal immigrants were America’s enemy. It was appalling, and it had consequences, but at least they weren’t American citizens. They genuinely were outsiders.
Things are different now. Today, the enemy is within–the “radical left.” That’s infinitely more dangerous to the health of our system, because it justifies extraconstitutional means to save what Trump defines as “America”: his side in the culture war.
Addressing this kind of division will be Biden’s most pressing, and most difficult, task upon taking office. If he fails, the system itself is at risk.