High Peak Liberal DemocratsA councillor has been accused of claiming that a person with learning difficulties "shouldn't be voting".
Trafford Council in Manchester said it was investigating the alleged remarks at a polling station during Thursday's elections.
The accusation against the unnamed politician was made by Kate Green, Labour MP for Stretford and Urmston and a shadow spokeswoman for disabled people.
A council spokesman said: "Trafford council can confirm it is aware of the situation and that its returning officer, Theresa Grant, was notified last night.
"She immediately launched a full investigation.
"Trafford council endeavours to make sure all residents who are eligible to vote have the opportunity to do so."
Ciara Lawrence, campaigns officer at Mencap, also suffers from a learning disability.
She said: "I have a right to vote and have my voice heard on things that matter to me, just like everyone else does. I went to my local polling station yesterday and cast my vote.
"That is my right and I won't be denied it.
"People who have ignorant, uninformed views about disabled people should not be in positions of power.
"Councillors should act as role models for their community, not needlessly insult the people that look up to them.
"Discriminating against disabled people is just as bad as racism and homophobia. There is no difference. Yet some people think it is okay to treat people with a disability as second-class citizens."
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