It’s a Trump rally. They cheer for him even if he says Harris has 5 penises.
Well, yes, but I think Trump fails to realise that he doesn't really need to convince the people at his rallies. With the exception of the guy who tried to assassinate him, those people are already voting for him.
In the past he used these rallies for bullshit theories as well, but they were kind of credible. Think about 'Crooked Hillary'. In hindsight everything he said is kind of ridiculous, but at the time Clinton didn't exactly come across as a trustworthy figure. It's not credible that Harris kills or condones killing babies that are already born. No one with an ounce of intelligence is going along with that.
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Not the first time Trump (and I believe some other Republican) has made this claim. Harris just happens to be the new target who's being accused of it.
They have generally referred to late term abortions.
Which are not a thing either. But it's still a lot different from killing an actual living born baby.
Even if it's not a new claim this is not a winning strategy though. You'd have to be insane to think it's plausible Democrats are out there killing babies. And there are only so many crazies to go around. Feed too many crazies, lose a lot of normies. That's how it works.