'It's modern day presidential'

President Donald Trump defended his aggressive use of Twitter on Saturday just hours after firing off his latest volley in his escalating feud with US media.

Following an early morning Twitter tirade at CNN, NBC and a morning show host he taunted as "dumb as a rock," the president then went on the defensive, touting his electoral accomplishments as justification for his increasingly hostile rhetoric.

Trump's deputy spokeswoman Sarah Huckabee Sanders said that Trump's attacks on Mika Brzezinski and Joe Scarborough, who headline the "Morning Joe" program on the left-leaning MSNBC cable network and other media were part of his natural instinct to "fight fire with fire."

On Saturday, those instincts seemed to be on display.

"My use of social media is not Presidential - it's MODERN DAY PRESIDENTIAL," Trump posted on Twitter, before adding his classic tagline "Make America Great Again!"

"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," Trump said in another tweet.

In recent days, the US leader has railed against major news organizations as "fake news".

Trump specially targeted CNN, a frequent punching bag for the president.

He launched a fresh attack on CNN yesterday by tweeting a video -- bizarre even by his standards -- showing him knocking down and beating a professional wrestling "villain" whose face had been replaced by a CNN logo.

In the 28-second and 10 years old video, Trump is seen knocking down another man in a suit who is standing next to a wrestling ring. Trump then pummels the man, whose face is covered by the CNN logo, repeatedly over the head.

At the end of the video, a fake CNN logo appears in the lower right corner of the screen with the words "FNN: Fraud News Network."

On Saturday, he riled against the news network with a series of tweets.

"I am extremely pleased to see that @CNN has finally been exposed as #FakeNews and garbage journalism. It's about time!" he tweeted, referring to an article that the cable news channel retracted, that claimed Congress was investigating links between Trump's administration and a Russian investment fund.

Three CNN journalists resigned over the article, which was posted on the network's website on June 22 before being yanked the next day.

"I am thinking about changing the name #FakeNews CNN to #FraudNewsCNN!" Trump posted.