Attorneys have sent Trump a letter from the Knight First Amendment Institute at Columbia University, arguing that blocking users suppresses speech by limiting interaction, as reported by mashable.com.

"This Twitter account operates as a 'designated public forum' for First Amendment purposes, and accordingly the viewpoint-based blocking of our clients is unconstitutional," the letter read, representing several Twitter users.  

In addition to Trump, the letter was also sent to Press Secretary Sean Spicer, the White House counsel and Dan Scavino, who heads social media for Trump. The letter criticizes the President and argues that the government "may not exclude people simply because it disagrees with them." 

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Holly O'Reilly, a client in the case, was reportedly blocked after tweeting Trump a GIF of his meeting with Pope Francis. 

This is pretty much how the whole world sees you.#AMJoy#SundayMorning pic.twitter.com/CycqYnKg8b

— Holly O'Reilly (@AynRandPaulRyan) May 28, 2017

Another client, Joseph Papp claims to have been blocked after tweeting Trump a post related to the President's speech about the US withdrawal from the Paris Climate Agreement, which included the hashtag #fakeleader. 

a @POTUS so mentally weak & intolerant of dissent he blocks US citizens critical of his policies from even reading his latest pronouncements pic.twitter.com/MjLuMUPqBD

— Joe Papp (@joepabike) June 4, 2017

"Each of them was blocked soon after having disagreed with or ridiculed you," the letter reads. 

While Trump faced strong criticism for his actions, no lawsuit has been filed. The letter, however, saw lawyers ask for the accounts to be unblocked, while legal actions are currently under consideration. (liz/kes)