I also do not understand how Trump keeps skating on facts and even his books (a veritable treasure chest of crazy). For instance. 40% of illegals are here because they overstayed their visas and did not come across the border. We tried to build a wall and failed as it didn't work (but cost a lot of money anyway and was never finished0 There was also the high tech solution, run by Boeing and a genuine mess. Then there is:
http://www.politifact.com/personalities/donald-trump/
http://www.factcheck.org/2015/08/trumps-amnesia/
find a LOT more, google: fact check trump