A Labour TD's told how people were tucking their trousers into their socks after he captured a rat in the Leinster House complex last week.
Kevin Humphreys spotted the rodent on the stairs on Friday.
There've been reports of a number of sightings of rats in recent weeks, however officials in Leinster House say the issue is 'under control'.
Deputy Humphreys has described how he tackled the animal: