Labour MP Richard Burgon broke convention on Wednesday, by calling for the end to the Monarchy before affirming an oath of allegiance to the Queen.
All MPs have to either swear an oath, or a non-religious affirmation, in order to take their seats. But the newly elected MP for East Leeds added his own introduction to the passage, highlighting his republicanism.
"As someone that believes that the head of state should be elected I make this oath in order to serve my constituents," he said.
The oath reads: I (name of Member) swear by Almighty God that I will be faithful and bear true allegiance to Her Majesty Queen Elizabeth, her heirs and successors, according to law. So help me God."
Most other MPs who hold republican views usually keep it to themselves. Although former sports minister Tony Banks famously crossed his fingers while reading out the words. And Dennis Skinner once added his own twist by saying: "I solemnly swear that I will bear true and faithful allegiance to the Queen when she pays her income tax."
In the past there have been calls for the oath of allegiance to the monarchy to be abandoned. In 2010 a cross party group of MPs, led by Lib Dem Norman Baker, suggested MPs should pledge to serve their constituents instead.