Ross Thomson
Allegations against the MP first came to light on Sunday after Scottish Labour MP Paul Sweeney claimed he had been groped by Thomson in a Westminster bar.
MP Paul Sweeney claimed he was left "paralysed" during the alleged "mortifying" incident, which has been strongly denied by MP Ross Thomson.
The Aberdeen South MP has now referred himself to internal party panel.
The Brexiteer was reportedly confronted by Met Police officers in Westminster's Strangers bar.