Look no further than what Trump impossibly promised of his health care bill. It literally has NONE of what he promised.
Trump lies far more than any sitting President in modern history. Prove me wrong. He tells the truth a whopping 17% of the time according to Politifact.
Defenders will tell you that Politifact is biased. Fine. Do you think that Politifact bias accounted for a 300% difference in truths told between Trump and Obama?
http://www.politifact.com/personalities/donald-trump/