Until quite recently the FCC had a "fairness doctrine" requiring broadcasters to treat politics evenhandedly. That seems far harder to reconcile with the First

Until quite recently the FCC had a "fairness doctrine" requiring broadcasters to treat politics evenhandedly. That seems far harder to reconcile with the First Amendment than a "no faked propaganda videos" rule. The Supreme Court explicitly said it was OK. The US has truth-in-advertising laws, which forbid advertisers to make certain kinds of deceptive claims. I'm not sure whether the Supreme Court has explicitly considered whether they're constitutional, but it's certainly heard plenty of cases related to those laws and never taken the opportunity to say "oh, and by the way, laws against false advertising are unconstitutional". If there's some reason why a law forbidding the use of faked/manipulated videos for political propaganda would be more inconsistent with the First Amendment than those, I'm not seeing it at all.