Unfortunately, 1/5 is far too few. Of the total adult pop., 28% voted for Trump. Of the 155,201,157 people who bothered to actually vote, 48% voted for Trump. 192,098,843 did not vote. A low estimate of the percentage of these folks who would support MAGA would be 40%. so, more like >1/3.
I'm not talking about projections or estimates, I'm talking about the proportion of the total population who actively voted for him. ~1/5 is that number.
Yes, as I showed. 28%. The math is incontrovertible: far closer to 1/3 of adults, than 1/5. (We cannot, obviously, include those under 19.)