I have no reason to doubt you
I know you're trying to be polite, but you sound sort of gullible here. You should doubt *everyone*, especially if they're trying to make a political point.
The actual plan is to limit the value of charitable tax deductions to 28% of the amount given, even if the giver is in a higher tax bracket (tax brackets max out at 35%). Plus, it's just a plan at this point and hasn't been passed by Congress.