If he touches his private part during ghusl, does he have to repeat wudu?
Question

My question is regarding tahara, especially about ghusl of janaba. After washing hands and private place, then making wudu’, is it permissible to wash the private place another time when we cover the whole body with water, or will it invalidate the wudu’ if I intend to pray after finishing ghusl?.
Praise be to Allah.The Sunnah is to wash the private part before starting ghusl, as is indicated by the report narrated by al-Bukhaari (276) and Muslim (317) from Ibn ‘Abbaas (may Allah be pleased with him) who said: Maymoonah said: I brought the Messenger of Allah (peace and blessings of Allah be upon him) water to do ghusl and screened him with a cloth. He poured water over his hands and washed them, then he poured water over his left hand with his right and washed his private part, then he struck his left hand on the floor and wiped it. Then he washed it and rinsed his mouth and nose, and washed his face and forearms, then he poured water over his head and all over his body, then he moved aside and washed his feet. 
If someone touches his private part after that or washes it again, then to be on the safe side, he should do wudu after he finishes ghusl, because the majority of scholars are of the view that touching the private part invalidates wudu. This has been discussed in the answer to question no. 82759. 
And Allah knows best.