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WASHINGTON (Reuters) - U.S. President Donald Trump warned Google, Facebook and Twitter to tread carefully on Tuesday after recently accusing internet and social media firms of political bias and censorship, without providing evidence.

“I think what Google and what others are doing, if you look at what’s going on with Twitter, if you look at what’s going on with Facebook, they better be careful because you can’t do that to people,” he said in remarks at the White House.

“So I think that Google, and Twitter and Facebook, they are really treading on very, very troubled territory and they have to be careful. It’s not fair to large portions of the population.”