Donald Trump has defended his use of social media in a series of tweets, hitting back at claims that it is not presidential.

The US president has come under fierce criticism from both Democrats and Republicans in recent days after using Twitter to suggest MSNBC presenter Mika Brzezinski had been “bleeding badly from a face-lift” when he saw her six months ago.

After stepping up his criticism on Saturday by calling Ms Brzezinski "dumb as a rock", Mr Trump later fired back at critics of his use of Twitter and renewed his feud with CNN.

"The FAKE & FRAUDULENT NEWS MEDIA is working hard to convince Republicans and others I should not use social media - but remember, I won.......the 2016 election with interviews, speeches and social media. I had to beat #FakeNews, and did. We will continue to WIN!"