Google is considering changing policies on political advertising in the midst of a raging public debate on the topic, according to Bloomberg.

Twitter earlier said it would rule out campaign ads altogether. It is not clear whether Google will do the same or will just limit campaign ads
in some way. Google gets a tiny fraction of sales from campaign ads on Search, YouTube and across the web.

Google declined to comment.

Digital campaign ads are a heated political topic for technology companies. An October ad from President Donald Trump’s re-election campaign erroneously claimed Democratic front-runner Joe Biden bribed Ukrainian officials. Facebook refused to remove the ad, prompting criticism of the social network operator.

Facebook’s Mark Zuckerberg defended his company’s policy of not fact-checking ads from politicians. He said the company has thought carefully about the issue and is taking a stance on principle, noting that political ads will make up less than 1% of revenue next year.