Because​ every President that I have seen has lied, and quite frequently. Hell, Obama gets lie of the year, Bush Jr. landed us in a war or two with some Whoppers, but I'm supposed to think that Trump is any different? Nope. He's unliked, thus the push for he's some kind of Super Liar, he's the POTUS of course he's a liar. If he acted like most think he should, it would just be another day at the office.