You have it all wrong. It is not the president that is causing division but rather it is the propaganda wing of the Democratic party; main stream media. For example, the Russian collusion narrative created both paranoia and division, yet there is no evidence, one year later, that is in proportion to all the outraged and paranoia, generated. It was scam by the Democrats to throw sands in the gears of Trump. Trump did not start that.
If you look at illegal immigration both President Clinton and President Obama, has a similar view on immigration. Go back and read their statements. President Obama set the record for deportations. He was using common sense. The media propaganda machine was silent, until Trump was elected, and did similar things as past Democrat Presidents. Immigration did not divide, until the propaganda machine was used.
If you wish to learn the truth, run an experiment. The link below is the official White House online news letter. It tells you everything the President does each day. Read this for one week. Along with this, shut off the news for one week, You will feel less divided. Then, if you are honest with yourself, will know the sources of the inner division.
https://www.whitehouse.gov/1600daily/