Alert to the possibility that he may not gain sufficient delegates from the primaries to avoid a ‘contested convention’ – which may not give him the nomination, Trump warns of “riots” if he is not made the Republican Party’s presidential nominee.
He’s not at all unaware of what he’s saying here.
Not exactly a direct threat. But as Robert Tracinski sagely observes, we all know what he means:
Nice country you got there, be a shame if something were to happen to it.