“What Trump policies are the most "terrifying" to you?”
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How about repealing the Affordable Care Act (with no plan to replace it) thereby leaving 22 million Americans without heath care?

Or expanding US nuclear capabilities and creating a new arms race.

Or denying the existence of global warming (a plot by the Chinese, according to him) and vowing to cancel the Paris climate agreement and withdraw funding for global warming initiatives

Or announcing at a NRA convention that he will abolish gun-free zones

Or overturning Roe v. Wade and criminalizing women who have abortions

Or how about Trump is just an egotistical maniac who cannot be trusted with the power of the presidency.