https://www.vice.com/en_us/article/zmj5w5/twitter-is-banning-political-ads

On Wednesday, Twitter co-founder Jack Dorsey announced in a series of tweets that the social network will stop running political ads, effective November 22. The final policy will be shared on November 15, Dorsey tweeted, which will explain some of the nuances in the new policy. For example, ads that promote voter registration will still be allowed on the platform, Dorsey said.

Dorsey pointed to a slew of issues that make political advertising a dicey proposition, including algorithmic targeting, misinformation, and deepfakes. It’s somewhat unclear what, exactly, will count as a "political" ad but Dorsey noted that Twitter is stopping ads regarding "issues," even from non-candidates.