Pres­i­dent Trump said he heard that Ms. Har­ris, the pre­sump­tive Demo­c­ra­t­ic vice-pres­i­den­tial nom­i­nee born in Cal­i­for­nia, was not eli­gi­ble for the tick­et, repeat­ing a the­o­ry that is ram­pant among his fol­low­ers. Con­sti­tu­tion­al schol­ars quick­ly called his words false and irresponsible.