A political "dog whistle" is a well established form of hate speech in the USA.

The use of a political dog whistle in the USA is a reason for an ethics review. It invites danger into the political process that can inhibit free participation in elections, too.

The fact a political dog whistle is based in racism is enough for an ethics review.

... a dog whistle is a political term (click here) about statements that appear innocent to the general public but they actually use subtle, coded language to communicate a secondary message to an intended group.

The messages are often racial or bigoted in nature, used to attract certain voters and energize them to vote.

RELATED WORDS

race-baiting
Cross-Race Effect
subliminal message
Make America Great Again
tunnel vision