"While that decision is incorrect in light of the Civil Rights Act, even Wong Kim Ark nonetheless would not secure citizenship for the children of illegal aliens.
The only Supreme Court support for birthright citizenship is Plyler v. Doe, a 5-to-4 Supreme Court decision written by ultra-liberal Justice William Brennan, which claimed that “no plausible distinction with respect to Fourteenth Amendment ‘jurisdiction’ can be drawn between resident aliens whose entry into the United States was lawful, and resident aliens whose entry was unlawful.” "
http://www.breitbart.com/big-government/2014/07/06/fourteenth-amendment-empowers-congress-to-end-birthright-citizenship/
In the meantime I'd expect him to do a superb job drying up most of the illegal immigration by vigorously enforcing the laws.
With as much leeway as Obama had to do whatever he wanted, Trump being a contract guy would see loopholes the size of airplanes. I would not be too worried about tat. He would drive is opponents to suicide and he would be very effective.