Do you have a source for that?
A quick Google search uncovers about ten such articles, here is one citation from national review picked at random: http://www.buzzfeed.com/andrewkaczynski/trump-on-there-being-zero-proof-he-opposed-iraq-before-the-w#.jd0Rm4gJB1
Donald Trump simply lied. Worse, he lied about George Bush lying when it was Donald Trump himself who lied. Yet you will hear allegation after allegation in this forum about how Ted Cruz is a liar. Anyone with a sense of decency would recoil from those allegations when applied to Ted Cruz. Donald Trump is a liar and he is unfit to conduct foreign policy because he is essentially a foreign policy ignoramus.