<sod >A government source told the Telegraph: 'Maybe the Speaker should think twice before making heavy political interventions like this. John Bercow can preach. 'It has no ramifications for him but it has ramifications for Britain. It's armchair politics. It's an important job he's doing, it's not Gogglebox.' THREE KEY HOLDERS: THE POWERFUL PEOPLE IN CHARGE OF WESTMINSTER HALLThe use of Westminster Hall is closely guarded by three powerful keyholders.< eod>< sod > A government source told the Telegraph: 'Maybe the Speaker should think twice before making heavy political interventions like this. John Bercow can preach. 'It has no ramifications for him but it has ramifications for Britain. It's armchair politics. It's an important job he's doing, it's not Gogglebox.' Lord Fowler told the Upper House today: 'There will be other leaders coming to this country who may also be controversial. 'The procedure as it stands means that either Mr Speaker or myself can effectively veto any proposal for a visiting leader to address parliament, at least as far as Westminster Hall is concerned. 'I think it is for parliament to consider whether there is a better way in which such decisions can be made. 'For the time being there may be a situation where one of the Speakers decides he cannot agree. 'Before we reach this point there should be, at the very least, some effort to reach consensus and a serious discussion on what the decision should be. I hope that we can now return to that previous practice.'  Since the President's executive order on immigration was imposed there have been mass protests in many cities, and more than 160 MPs have signed a motion calling for him to be denied the honour of speaking to both Houses of Parliament.< eod>