A BNP spokesman said: ''Mr Griffin has already declared that no-one was offended at his comments.
''We have a number of members who have disabilities who are very happy with Mr Griffin's leadership.
''People with disabilities call each all sorts of names - that's one of the ways they deal with it. We shouldn't be trying to make something out of nothing.
''People with disabilities are perfectly entitled to talk about them.
''And let's remember, Mr Griffin gets called all sorts of things all the time.''
The North West will tonight elect eight MEPs to sit in the European Parliament for the next five years.
Britons will go to the polls to decide who will represent them in Brussels and Strasbourg. Here is a guide to the European election.
On 22 May 2014, eight MEPs will be elected from the North West. Find out who the candidates are.