The gene creates the normal despising of Donald Trump that is innate in all rational human beings. Researchers believe it developed in early man over 600,000 years ago in response to the existence of a creature known as the orange-crested douchebagius, which humankind came to learn was combative, stupid, and known to cover its mostly hairless head with profusions of orange leaves.
It is believed further that in some unfortunate modern humans the gene malfunctions causing the afflicted individual to - while realizing that Donald Trump is indeed an asshole - believe he is a charming asshole. This aberration occurs in a small but vociferous percentage of the population today, estimated to be roughly in the range of "too many."
The race is now on to develop a method to reverse the impact of the mutant gene and restore those suffering from its malicious impact to normalcy. It is important that great care be taken that any treatment developed not impact the functioning of a nearby chromosome which houses the "Hillary Does Lie, But Let's Face It She is Running Against an Asshole Gene."