In an interview with Britain's ITV channel, he said he needed social media to communicate with voters in the era of what he termed fake news.
"If I don't have that form of communication I can't defend myself," Trump said in an interview broadcast on Sunday. "I get a lot of fake news, a lot of news that is very false or made up."
When asked about whether he was lying in bed with his phone thinking of how to wind people up, Trump said: "Well, perhaps sometimes in bed, perhaps sometimes at breakfast or lunch or whatever, but generally speaking during the early morning, or during the evening I can do whatever, but I am very busy during the day, very long hours. I am busy."