This is a harbinger of disaster. Ordinarily, when one party has its presumptive nominee two months before the convention (while the other party is still fighting it out), the presumptive nominee has a golden opportunity to refine and project his message for the general election, while consolidating support within the party. Instead, Trump has squandered that opportunity, and handed Clinton a sword to slay him with irrefutable charges of racialism, if not racism. Moreover, Clinton is pitching hard the meme that Trump is temperamentally unstable and unfit for the office, making the existential argument that Trump cannot be trusted with the nuclear code.
And she's right.
Trump is flaming out, and will take the party with him.