Palmerston, a cat that was adopted by the Foreign and Commonwealth Office, had been recently announced as the "chief mouser" to help tackle the problem of mice in the building in central London.
However, as the debate around Britain's membership of the EU heats up in the lead up to the June 23 referendum, a member of the camp in favour of remaining in the economic bloc told the House of Commons yesterday that those in favour of Brexit may fear Palmerston has not been fully vetted.
The foreign secretary chose to the address the bizarre query, claiming Palmerston's attendance record had been impeccable.
He told MPs: "He is definitely not a mole. I can categorically assure my honourable friend that Palmerston has been regularly vetted."
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He went on to reveal that the chief mouser had been performing his duties well and had caught three mice in his first six weeks.
"He has settled in perfectly and is performing his services more than satisfactorily," he said.
The senior minister also claimed that the cat was proving an internet sensation and could have more Twitter followers than he does by the time Parliament breaks up for the summer in July.