Trump retweets Melbourne terror story in latest Twitter storm

US President Donald Trump has offered up his opinion on Melbourne terrorist Yacqub Khayre's deadly rampage via Twitter.

During the president's latest morning Twitter storm, Mr Trump on Tuesday retweeted a TV report about Khayre's attack that was aired on Rupert Murdoch's FOX News channel in the US.

The report was headlined: "FOX NEWS ALERT: ISIS claims responsibility for hostage siege in Melbourne, Australia that killed 1 person and injured 3 cops".

Mr Trump has been criticised for his use of Twitter and errors he has made in tweets.

In the aftermath of the weekend London terror attack Mr Trump used Twitter to target London Mayor Sadiq Khan.

"Pathetic excuse by London Mayor Sadiq Khan who had to think fast on his "no reason to be alarmed" statement," Mr Trump wrote on Monday.

"MSM (mainstream media) is working hard to sell it!"

In Tuesday's Twitter storm where he fired off eight in several hours, Mr Trump defended his use of social media.

"The FAKE MSM is working so hard trying to get me not to use Social Media," he wrote.

"They hate that I can get the honest and unfiltered message out."