Washington DC (CNN) Facebook has stopped the Trump campaign from running its racist anti-immigration commercial as an ad on the site.

"This ad violates Facebook's advertising policy against sensational content so we are rejecting it. While the video is allowed to be posted on Facebook, it cannot receive paid distribution," Facebook said in a statement Monday afternoon.

The move came shortly after NBC and Fox News said they would stop airing the ad across their networks. CNN had previously determined that the ad is racist and declined to sell airtime for it.

The Trump campaign began running the ad on Facebook on Sunday, targeting voters in Florida and Arizona. By Monday morning, it had reached millions of users on the platform.

A Facebook spokesperson said the ad had been allowed to run in error.

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