Trump's last full-fledged news conference was July 27, which he held at his Miami-area golf course as counter-programming to the ongoing Democratic National Convention. It was there that Trump called upon Russia to hack his opponent Hillary Clinton's emails saying, "I will tell you this, Russia: If you're listening, I hope you're able to find the 30,000 emails that are missing."
His staff later insisted that Trump was joking.
Maybe I would stick to Tweeting, too. I'd stick to the day job and not try to be a comedian if I was him as well.