U.S. President Donald Trump accused Twitter on Thursday of restricting the visibility of prominent Republicans on its platform, and promised to investigate.

Trump did not however provide any evidence to that effect.

“Twitter ‘SHADOW BANNING’ prominent Republicans. Not good.

“We will look into this discriminatory and illegal practice at once!” the Republican president wrote in a Twitter post.

On Wednesday, Republican party Chairperson Ronna McDaniel also condemned the practice saying that “the notion that social media companies would suppress certain political points of view should concern every American.”