So far as I know, zero illegal aliens voted in our elections. And aside from municipal elections that allow all residents to vote irrespective of nationality, legal aliens don't vote either.
Do you have any data on terrorist attacks in the US for the last three years? Because I haven't heard of any. Data that I can find shows the vast majority of terrorist attacks in the US are perpetrated by far right wing extremists who are US citizens. Most of the rest are committed by Islamic extremists who are usually here legally.
Why would you think he's divisive? The guy is about as centrist as you can get, which is why the progressives can't stand him. I think you're overreaction may say more about you than him.