Welsh Liberal Democrat leader Jane Dodds has called for Delyn MP Rob Roberts to resign following reports inappropriate behaviour towards staff.
Messages seen by BBC Wales showed the MP inviting a 21-year-old female intern to “fool around” with him.
The MP who was elected in December also admitted asking out another House of Commons employee, which led them to move position.
Jane Dodds said that either Rob Roberts should resign or the Welsh Conservatives should withdraw the whip.
“MPs are meant to operate with integrity and respect for others, not use their position of power to proposition employees – particularly when they are in a vulnerable state,” she said.
“I hope Parliament has already reached out to offer support to those employees affected.
“This kind of behaviour is not, and should never be, excusable. Rob Roberts needs to resign so we can put an end to this saga of scandals.
“Failing that, the Welsh Conservatives must act and show they will not tolerate this kind of behaviour.”
A Conservative Party spokesperson said: “Our party takes all allegations extremely seriously and has safeguarding and complaints processes in place to investigate complaints made to it under the party’s code of conduct.”
Rob Roberts did not provide a comment when asked for a response.