As much as I dislike Trump, I'll come to his defense here some. Even if the audio does sound like he said what the WSJ said, it's a silly thing to attack him on. It was a slightly unclear pronunciation. Other than a slight chuckle at things like that, I think it's silly to attack people for misspeaking. Sometimes the words that come out of our mouths aren't what we really intended them to be - dropping a vowel, accidentally substituting one word for another, etc.
That said, Trump's reaction is pretty childish too.