A row has erupted in the Senedd after Cymdeithas yr Iaith (The Welsh Language Society) refused to answer questions by UKIP in a committee hearing on the basis the party promote and tolerate prejudiced attitudes.
The organisation were due to appear in front of the Assembly's culture committee but their invite has been withdrawn after they indicated they were unprepared to answer Neil Hamilton's questions.
He's UKIP's Welsh leader and is the party's representative on the committee.
The committee are taking evidence as part of its inquiry into Welsh language standards.
Cymdeithas yr Iaith Gymraeg criticised the decision as 'undemocratic' and 'extremely disappointing'.
UKIP's Welsh leader said he hoped the language group would soon 'grow up'.
The National Assembly said it was not for witnesses to 'dictate' who is allowed to ask questions.
Bethan Jenkins is the Committee chairwoman.