J.K. Rowling
J.K. Rowling attends the 70th EE British Academy Film Awards (BAFTA) at Royal Albert Hall in London, England, Feb. 12, 2017. Getty Images

Author J.K. Rowling slammed President Donald Trump Friday after a video posted on social media showed the commander-in-chief seeming to ignore a boy in a wheelchair who tried to shake his hands.

In the video of a meeting in the White House, the boy is seen extending his hand for the president to shake. However, Trump ignores him and goes on to shake the hands of several other people who were present in the room.

Read: JK Rowling vs Donald Trump: 'Harry Potter' Author Uses Twitter To Bash President, Again

An extended cut of the video, however, does show Trump greeting the boy when he entered room before giving his speech. The video that went viral, and which apparently shows him snubbing the boy, shows him leaving the room after his speech.

Harry Potter author Rowling posted the video on her Twitter account along with a quote by author Maya Angelou as its caption: "When someone shows you who they are, believe them."

The author then went on to blast the U.S. president for his insensitive action in a series of tweets.

"Trump imitated a disabled reporter. Now he pretends not to see a child in a wheelchair, as though frightened he might catch his condition. This monster of narcissism values only himself and his pale reflections. The disabled, minorities, transgender people, the poor, women (unless related to him by ties of blood, and therefore his creations) are treated with contempt, because they do not resemble Trump," Rowling wrote in her tweets.

Rowling has a history of attacking Trump on Twitter, and her criticisms have been quite vocal and public.

Earlier this week when Trump announced a ban on transgender people serving in the military, Rowling took to Twitter to mock the president. Rowling compared the president's smiling face to a frog’s, saying: "Well, kudos to Aesop. It turns out 'The Frogs Who Desired a King' wasn’t a fable, it was an actual bloody prediction."

Read: JK Rowling Calls Trump A ‘Tiny Little Man’ After He Pushes Montenegro Prime Minister Dusko Markovic

She then aimed her tweets on conservative political commentator Tomi Lahren, who posted a tweet supporting Trump's ban on transgender people in the military. "Pres Trump dedicated to putting radical Muslims in graves whereas Pres Obama was dedicated to putting men in the ladies room," Lahren wrote on her Twitter account.

Rowling replied with a tweet dripping with sarcasm.

In June, after Trump's insulting tweets about Morning Joe hosts Joe Scarborough and Mika Brzezinski, Rowling hit back at the president with the words of former President Abraham Lincoln.

"'Nearly all men can stand adversity, but if you want to test a man's character, give him power,'" she captioned a screenshot of the tweets, quoting Lincoln.

She once even compared Trump to her book's villain "Voldemort."

She also compared the president to a Twitter egg once earlier.

She also once mocked Trump over a wrong spelling in one of his tweets.