Jennie Rigg, chair of the Lib Dems LGBT group, says on Twitter that she has sent an email to the membership resigning after the party accepted Phillip Lee as an MP.
Among her concerns is his support in 2014 for banning HIV-positive immigrants from Britain.
In a blogpost, Ms Rigg accused him of being a "homophobe, a xenophobe, and someone who thinks people should be barred from the country if they are ill".
The Tory stench follows far