Because he likes America and wants to make America a better place for Americans to live.
Meanwhile the liberal Democrats hate America, hate American citizens, and only like America for the tax money they can get access to, money they steal and give to non-working, non-Americans to make themselves look important.
If you felt ill when Obama made his speech in Europe apologizing for what America has done in the last 100 years - you are going to be retching when repatriations and the new Social Order come down the pike in 2020 should liberals take the white house. AOC's and Warren's 'plan' is to tax all workers so hard it can provide a 'living wage' for everyone else who can not work or does not want to work. I imagine there will be allot of 'does not want to work' if they can get $45,000 free a year.
Trump does not want the US to look like a 3rd world sh!thole. Democrats claim American is already a sh!thole and are trying to hard to prove it.
Oh, and just wait until you hit 65 and try to collect social security. Never mind you probably paid over a million (with 50 years interest) since you were 16. Your 'payment' will be averaged against illegal aliens who never paid into it, or, maybe paid into it for 3-5 years. Instead of the $4,000 you earned and deserved you will get to live off of $1800 a month. I sure hope you have a railroad retirement plan and separate 401(k) to supplement social security or you'll be living in a room with 5 others and sharing cans of cat food. All while telling each other how 'awesome' you have it and love socialism.