As to the charge of holocaust denial, I find a reference to D. Kranzler, Thy Brother's Blood, Mes. Publications, 1987, p. 279. from Wikipedia.
In Slovakia, for example, Archbishop Karol Kmetko responded to a Jewish plea of assistance in March 1942 with the words, "You shall not merely be deported. You shall be killed..And this will be your punishment for your killing of our saviour." -
Source
This is one reference to a Holocaust-denying Bishop, though his viewpoint was later rendered defunct by the Second Vatican Council during the early-mid 60s. He was excommunicated in 1988, and the excommunication was later lifted in 2009.
Perhaps it is a weaker example, but there was a time that Holocaust denial was deemed "fair" for Catholic officials, considering it took until 1962 for the Church to officially come out and state what their position on the Holocaust was, and even more so, that it took another 26 years for them to excommunicate the Bishop for his antisemitic views. There are mixed reports that say this was common for the Church during the War, but I do not have any sources handy.