The president took to Twitter on Thursday to express his disappointment about Twitter and its alleged treatment of Republicans.

Trump writes: “Twitter “SHADOW BANNING” prominent Republicans. Not good. We will look into this discriminatory and illegal practice at once! Many complaints.”

Shadow banning (also called stealth banning, ghost banning or comment ghosting) is the act of blocking a user or their content from an online community such that it will not be readily apparent to the user that they have been banned.