Bjoern Hoecke of the anti-immigration Alternative for Germany (AfD) had labelled Berlin's central Holocaust memorial a "monument of shame in the heart of the capital".
Hoecke, AfD chairman in Thuringia state, also called in his January 17 speech for "a 180-degree shift in the politics of remembrance", arguing Germany should focus less on its shame over World War II and the Holocaust.
When Hoecke showed up today at the Thuringia state assembly, the speaker barred him from attending a ceremony marking International Holocaust Remembrance Day and honouring those killed at the Buchenwald concentration camp.
Another row was brewing after Hoecke said yesterday he planned to attend a Holocaust memorial event at the Buchenwald memorial site, despite a request by organisers there that he stay away.
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"After this speech... Hoecke's participation in the wreath laying in the former Buchenwald concentration camp is not acceptable," wrote Rikola-Gunnar Luettgenau, the deputy head of the foundation which manages the memorial site.
Hoecke immediately replied in a letter that was quoted by German media as saying: "It is simply not up to you to decide who can participate... In this official commemoration and who cannot," adding that he was "obviously" sticking to his plan to attend the event later today.
"The survivors of Nazi barbarism and the relatives of those murdered cannot allow the importance of the Holocaust to be relativised and the memory of the victims to be degraded," wrote Herz.
The remarks by Hoecke, a former history teacher who is considered to be on the right-wing fringe of the party, caused debate within the AfD but it ultimately decided against expelling him.
The AfD, which started as a eurosceptic party in 2013, has since shifted to mainly railing against multiculturalism, Islam and the over one million asylum seekers who arrived since 2015 under Chancellor Angela Merkel, its declared enemy.