So Trump had a transcript of a past call with Mexican President Pena Nieto released to the public in which the Mexican president refused to pay for any border wall that Trump is going to try and put up. (As he should) Trump then went on to tell him that he can't make those claims because:
"You cannot say that to the press," Trump said on the phone call. "The press is going to go with that and I cannot live with that. You cannot say that to the press because I cannot negotiate under those circumstances."
No shit Trump he's telling you there are no negotiations because he doesn't want to pay for your stupid dick wall. You can't run a country like a fucking business. A lot of countries don't want to negotiate because you want something.