Former Tory leader Iain Duncan Smith was caught on camera appearing to pick his nose and eat the contents.
The clip was widely shared on social media as the House of Commons debated Brexit yesterday.
Duncan Smith, sitting on the backbenches, appeared to dig into his nose while Tory rebel Ken Clarke addressed MPs two rows ahead of him.
One commenter wrote on Twitter alongside the video: "Iain Duncan Smith even stockpiling his bogeys, Brexit really is a disaster."
Another branded it "absolutely disgusting".
He is not the only Conservative MP whose actions in the House have come under scrutiny.
Jacob Rees-Mogg has been accused of disrespecting Parliament after slouching on the Government front bench during the emergency Brexit debate.
The Commons leader was listening to speeches in the emergency session, in which opposition MPs are trying to seize control of the order paper to force Boris Johnson to delay Brexit.
But his relaxed posture sparked fury among TV viewers and fellow MPs.
Labour's Anna Turley described his prostrate pose the "physical embodiment of arrogance, entitlement, disrespect and contempt for our Parliament."
And Green Party MP Caroline Lucas railed at him in her speech.
She said: "The Leader of the House, who I have to say with his body language this evening, has been so contemptuous of this house.
"And for the benefit of Hansard, the Leader of the House has been spread across three seats, lying out as if that was something very boring for him to listen to tonight."
Furious MPs shouted "sit up!"
Lib Dem Tom Brake added: "Perhaps it would be possible to get the Leader of the House a pillow to make him more comfortable?"
