As best I recall he’s used 58% for a long time. Is this the 1st time someone has disputed it?
No. There was a substantial grousing about this number when Trump or somebody floated it before. The first rebuttal was to conflate his remark with the unemployment figure.
WaPo - Recidivism Watch: Trump campaign on 58 percent of black youths `not working' - Aug. 28, 2016
Trump: God bless you, everybody!!
I think the 58% has been confirmed and cited elsewhere, hasn’t it?