Throughout his life, and into his presidency, Trump voiced his belief that genes allowed for inherent superiority of some over others. He has invoked “racehorse theory” in relation to these beliefs, referencing the selective breeding of horses.

He reiterated these beliefs at a Minnesota rally on September 18, 2020:

This state was pioneered by men and women who braved the wilderness and the winters to build a better life for themselves and for their families. They were tough, and they were strong. You have good genes, you know that, right? You have good genes. A lot of it’s about the genes isn’t it, don’t you believe? The racehorse theory you think was so different? You have good genes in Minnesota.

The application of “racehorse theory” to people is known as eugenics, which has been the motivation behind a wide swath of crimes against humanity, from forced sterilizations to genocide.

While Trump frequently claimed that his genes were largely responsible for his skills and success, over $400 million was inherited by Trump using various tax evasion schemes, and one of his former professors referred to him as “the dumbest goddamn student I ever had.”

Time – Donald Trump Loves to Talk About His ‘Good Genes’
Business Insider – Trump told a crowd of nearly all white supporters that they have ‘good genes’
The Daily Beast – Trump Rambles About ‘Good Genes’ and ‘Racehorse Theory’ at Minnesota Campaign Rally