The letter was copied to the White House counsel, Donald F. McGahn II; the White House press secretary, Sean Spicer; and the White House director of social media, Dan Scavino Jr. That's because when a user is blocked on Twitter, they can no longer see a user's account, or comment on tweets the user has made.
"The Knight Institute asked the President to unblock its clients, or to direct his subordinates to do so", the release added.
In response, Papp tweeted a screenshot of his blocking with the message "a @POTUS so mentally weak & intolerant of dissent he blocks US citizens critical of his politics from even reading his latest pronouncements".
"The blocking of users from your Twitter account suppresses speech in a number of ways", the letter stated. He also argued that Trump has 1st Amendment rights on Twitter that could supersede those of the people he blocks, and that not everyone gets the right to respond to the president's statements - not unlike a news conference, where only some reporters get the opportunity to ask a question.
Because when it comes to the President's Twitter account, well, that's a little different.
If the institute should sue, Trump could claim his @realDonaldTrump account is for personal use and separate from his official duties as president, Goldman said.
What's remarkable is that Trump's logic regarding his Twitter feed isn't even the most tortured defense of his social media practices out there this morning.
Tuesday's poll on Trump also looked at the importance voters were assigning to the investigation into Russia's possible interference in the presidential election, with the split similarly based on voters' political parties. "God, you're embarrassing." wrote O'Reilly. "The effect of that is that he can't exclude people based exclusively on his disagreement with them".
"The president is president of the United States", Spicer said, "so they are considered official statements by the president of the United States". While Twitter may be a private platform, Trump is using it in his official capacity. If this ever went to court, it would be a case of first impression.
The new POLITICO/Morning Consult survey found that almost seven in 10 voters believe the president uses the social media platform too much and about 60 percent think his Twitter usage is a bad thing.
"The significant harm, and one for which there aren't obvious workarounds, is that you're excluded from the comment threads discussing the president's tweets", Abdo said. Reuters noted that the account blocked users after they posted content that "criticized, mocked or disagreed" with the president.
The findings, which echo those of an April survey of millennials, came as the president faced pushback over his tweeting from Republican New Jersey Gov. Chris Christie and 2016 GOP presidential hopeful Carly Fiorina. If applied to the president however, a court ruling could trickle down to Congress and local politicians.