Labour MP Paul Flynn has been suspended from the House of Commons for five days without pay after what Defence Secretary Philip Hammond claimed were 'scandalous' comments.
The MP for Newport West accused the Ministry of Defence ministerial team of lying over Afghanistan policy.
Speaker John Bercow demanded Mr Flynn retract his statement but he refused, insisting it was more important for him to leave it on the record.
Questioning Mr Hammond during an urgent question, Mr Flynn said:
Speaker John Bercow intervened, requesting clarification of Mr Flynn's remarks and for him to retract any suggestion ministers had lied to the Commons.
But Mr Flynn said:
The speaker called on Deputy Leader of the House Tom Brake to suspend Mr Flynn, a move agreed by MPs.
As the House of Commons is about to take a three week break for the party conferences, Mr Flynn will have to serve most of his ban next month.