Twitter CEO Jack Dorsey said Wednesday that his social platform will no longer allow political advertisements. Dorsey shared the news in a series of tweets.

“We believe political message reach should be earned, not bought,” Dorsey wrote. Further, he listed several reasons for the decision including the users choice to see ads, the platform’s promotion of ads that could potentially influence voting outcomes and mislead users with misinformation.

For now, Twitter plans to only ban candidate ads and not issue ads. The full policy will be released on Nov. 15.

Read the announcement below:

A political message earns reach when people decide to follow an account or retweet. Paying for reach removes that decision, forcing highly optimized and targeted political messages on people. We believe this decision should not be compromised by money. — jack (@jack) October 30, 2019

Internet political ads present entirely new challenges to civic discourse: machine learning-based optimization of messaging and micro-targeting, unchecked misleading information, and deep fakes. All at increasing velocity, sophistication, and overwhelming scale. — jack (@jack) October 30, 2019

For instance, it‘s not credible for us to say: “We’re working hard to stop people from gaming our systems to spread misleading info, buuut if someone pays us to target and force people to see their political ad…well…they can say whatever they want! 😉” — jack (@jack) October 30, 2019

We’re well aware we‘re a small part of a much larger political advertising ecosystem. Some might argue our actions today could favor incumbents. But we have witnessed many social movements reach massive scale without any political advertising. I trust this will only grow. — jack (@jack) October 30, 2019

We’ll share the final policy by 11/15, including a few exceptions (ads in support of voter registration will still be allowed, for instance). We’ll start enforcing our new policy on 11/22 to provide current advertisers a notice period before this change goes into effect. — jack (@jack) October 30, 2019