President Donald Trump uses Twitter frequently to get his "unfiltered" messages out -- but he has recently decided who will not be receiving those messages.
Trump used his 140-character tweets throughout his 2016 campaign for the White House and continues to use the social media platform six months into his administration.
The president's account has blocked nearly 40 people from being able to view his tweets.
RELATED: Every account Trump follows on Twitter
Who Donald Trump follows on Twitter
U.S. first lady Melania Trump
Donald Trump Jr. and his wife Vanessa
Eric Trump and his wife Lara Trump
Photographer: Andrew Harrer/Bloomberg via Getty Images
The Trump Organization and several of his hotels and golf courses
1. Trump Los Angeles
2. Trump Washington D.C.
3. Trump Hotel Chicago
4. Trump Vegas Hotel
5. Trump Charlotte
6. Trump National Doral
7. Trump Waikiki
8. Trump Golf
(Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
U.S. Vice President Mike Pence
White House Chief of Staff Reince Priebus
Trump's personal attorney Michael Cohen
(Photo credit should read BRYAN R. SMITH/AFP/Getty Images)
White House Senior Advisor Kellyanne Conway
Dan Scavino White House Social Media Manager & Trump's assistant
Former Donald Trump campaign manager Corey Lewandowski
Former Trump campaign spokeswoman Katrina Pierson
Executive producer/Actress Roma Downey and her husband producer Mark Burnett
WWE Chairman and CEO Vince McMahon
(Photo by Ethan Miller/Getty Images)
Golf legend Gary Player
Photographer: Waldo Swiegers/Bloomberg via Getty Images
Author and television host Bill O'Reilly
(Photo by Teresa Kroeger/Getty Images)
Fox News host Laura Ingraham
(Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Fox News Host Eric Bolling
(Photo by Roy Rochlin/Getty Images)
Fox News host Sean Hannity
(Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
Fox & Friends' talk show
(Photo by Astrid Stawiarz/Getty Images)
Opinion site Fox Nation
"The Celebrity Apprentice" Participant and Fox News personality Geraldo Rivera
MSNBC host Greta Van Susteren
(Photo by Al Pereira/WireImage)
Political commentator & author Ann Coulter
The Drudge Report - a heavily conservative news aggregation website
(pictured: the site's owner Matt Drudge)
(Photo by Harry Hamburg/NY Daily News Archive via Getty Images)
British journalist and television personality Piers Morgan
(Photo credit should read LEON NEAL/AFP/Getty Images)
Team Trump the official Trump news account for supporters
REUTERS/Patrick T. Fallon
Youtube stars "Diamond & Silk"
Former 'Apprentice' cast member Katrina Campins
(Photo by Dave Kotinsky/Getty Images)
The official White House account
(Photo by Eric Thayer/Getty Images)
On Tuesday morning, the progressive veterans group VoteVets told its followers that it was blocked.
Just hours later, novelist Stephen King said he was also prevented to looking at Trump's tweets.
Multiple critics of the President have also been blocked for trolling his administration.
Columbia University's Knight First Amendment Institute is representing the group of accounts that have been blocked.
SEE ALSO: President Trump takes to Twitter on James Comey's 'leaks': 'Totally illegal? Very 'cowardly!'
According to the Huffington Post, close to 40 people have gotten in touch with the Knight Institute to tell them they've been blocked.