Vaughan Gething releases resignation statementpublished at 11:26 British Summer Time 16 July
In a statement Vaughan Gething makes no apology for the events of the last few months, or for his campaign donations.
He says he had hoped that over the summer, "rebuilding and renewal could take place under my leadership".
"I recognise now that this is not possible," he says.
He says it has been the most difficult time "for me and my family".
"A growing assertion that some kind of wrongdoing has taken place has been pernicious, politically motivated and patently untrue," he says.
"In 11 years as a minister, I have never ever made a decision for personal gain. I have never ever misused or abused my ministerial responsibilities.
"My integrity matters. I have not compromised it.
"I regret that the burden of proof is no longer an important commodity in the language of our politics. I do hope that can change.
"To those in Wales who look like me - many of whom I know feel personally bruised and worried by this moment, I know that our country can be better. I know that cannot happen without us."
He says he will discuss a timetable for the election of a new leader.