Piers Morgan in his interview on Fox News on Monday fueled his ongoing Twitter war with J.K. Rowling calling the author a "serial loser". Morgan was also quoted calling Rowling "the worst celebrity on the planet".

J.K. Rowling has been vocal about being an anti-Trump. In the recent US Election, she bashed Donald Trump imploring Americans to Vote for Hillary Clinton.

The clash between the two British celebrities began when Rowling tweeted one of the video clips from Bill Maher's show. Along with the short clip, the Harry Potter author wrote how she is satisfied with Maher telling Morgan to "f**k off" upon his remarks about Trump's recent legislative orders.

Morgan fired back and retweeted Rowling's post and wrote: "This is why I have never read a single word of Harry Potter". And so the spate of tweets between Rowling and Morgan followed along with other celebrities like Chelsea Clinton joining in siding with Rowling.

And to add up the on-going feud, Morgan made negative remarks about Rowling national television. The British TV personality told Rowling to just "shut up" and stick to the author's "wizard" world. 

In the past, Piers Morgan has always come into Donald Trump's defense whenever he feels personal attack are being thrown into the US president. Morgan on Mail Online wrote about how "hypocrite" the democrats are for not backing up Trump's victory and not defending American's democracy from foreign meddling.

Both Rowling and Morgan always create headlines with their tweets in some time. Rowling is known to tweet back with witty remarks to users who criticize her. While Morgan, though British is not shy to commentate about US politics.