It's another week, folks, and that can only mean one thing — a fresh new chapter in the ongoing Twitter saga that is J.K. Rowling vs. Donald Trump.

This time, the topic in question was a current favourite of the president's: fake news.

On Monday, he went on one of his typical early morning Twitter tirades, this time attacking "negative polls" regarding his attempts to implement a travel ban.

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Rowling's response was as swift and savage as ever.

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This time — as well as the usual support from fans — she also received some well-timed back-up from Ricky Gervais.

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Soon, the mirror jokes had started.

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When it comes to Twitter, J.K. Rowling is an unstoppable force.