Has anyone every proposed the idea of 3rd party verification of political ads and robo calls?

Since both campaigns are spreading misinformation, I wondered if a 3rd party ad/call approval system would ever work, or make any sense. Basically a campaign could not run any ad without getting the approval of a “non-partisan” watchdog group. This group would fact check and ask the campaigns to tone down unnecessarily negative ads. Would it ever be possible to have a non-partisan approval team? At the very least, I don’t think that any campaign should be allowed to send out mailers with information that can be proven false, or intentionally misleading.