It's only deductible if your total itemized deductions exceed your standard deduction. Otherwise, it's just another congressional shell game to fool the general public.
I think the proposed car loan interest deduction is an “above-the-line deduction”...not an itemized deduction.
But in any case massively increasing the “standard deduction” (PDJT 1st term) is really hurting church tithing and non-profits that rely on donations.