https://www.theguardian.com/technology/2020/oct/07/facebook-stop-political-ads-policy-3-november

The policy change is intended to ‘reduce opportunities for confusion or abuse’ and did not give a timeline for advertising to return

Facebook has announced significant changes to its advertising and misinformation policies, saying it will stop running political ads in the United States after polls close on 3 November for an undetermined period of time.