To say of Trump or anyone that he is divisive is to say that he promotes (political) division. But there is no need to promote it these days since we already have plenty of it. We are a deeply and perhaps irreparably divided nation. So it is not right to say that Trump is divisive: he is standing on one side of an already existing divide.
Trump did not create the divide between those who stand for the rule of law and oppose sanctuary cities, porous borders, and irresponsibly lax legal immigration policies. What he did is take up these issues fearlessly, something his milque-toast colleagues could not bring themselves to do.
And he has met with some success: illegal immigration is down some 50%.
Liberals call him a bigot, a racist, a xenophobe. That they engage in this slander shows that the nation is bitterly divided over fundamental questions.
Too often journalistic word-slingers shoot first and ask questions never. Wouldn't it be nice if they thought before their lemming-like and knee-jerk deployment of such adjectives as 'divisive'?
Language matters.