Peter Irons, professor emeritus of political science at the University of California, San Diego, demonstrates that racism and extreme intemperance are impeachable offenses. 

He attempted “to bring into disgrace, ridicule, hatred, contempt and reproach the Congress of the United States.”

He delivered “with a loud voice, intemperate, inflammatory, and scandalous harangues, and has uttered loud threats and bitter menaces, against Congress [and] the laws of the United States, amid the cries, jeers and laughter of the multitudes.”

He has brought the “high office of the President of the United States into contempt, ridicule and disgrace.”

For these reasons, President Andrew Johnson was impeached.

Johnson’s deep-rooted racism, along with his verbal excoriation of his congressional foes as “treasonous” — something our current president has also done — led to his impeachment in 1868. Article 10 of his impeachment indictment provides a legal basis and historical precedent for making a president’s racist speech an impeachable offense, by itself, as evidence of unfitness to hold the highest and most powerful office in the land.