In this day and age, sorry, but I am going to side with the journalists, with access to the Transcripts of the actual calls, then with Trump claiming to have not said something he said (where have we heard that one before). Call it Fake News, throw shade at the sources, but Trump acting like Trump is a lot more believable then Trump not acting like Trump.
At least you wont have any problem doing the whole international Isolationist policy thing. I mean, at the rate he is going, I fully expect that the only bridges he will have left to burn by the end of the month will be Canadian and Russian, and I fully expect him to turn on Canada the moment it crosses his mind that our border is longer than Mexico's and even less well defended.
Oh, and in other news, Reuters has officially declared the Trump Government to be on the same level as such authoritarian states as Turkey, the Philippines, Egypt, Iraq, Yemen, Thailand, China, Zimbabwe, and Russia. Congrats. You just got downgraded by one of the most respected impartial journalistic sources on the planet.