Jami-Lee Ross has released text messages in which he discussed the now-infamous $100,000 donation with National Party general manager Greg Hamilton.
Read the exchange from last Wednesday below:
Mr Ross says the text messages prove the National Party knew the donation was legally dubious a week ago.
In response, National Party president Peter Goodfellow has released screenshots from the same conversation taken from Mr Hamilton's phone.
He says the exchange in question took place in the space of 34 minutes.
Mr Goodfellow is denying National received a $100,000 donation.
"There was no such donation," he said in a statement.
"The Botany Electorate of the National Party received eight donations, and Mr Ross declared eight donations to us."