[naturalman1975]

It is customary for visiting presidents to address MPs and members of the House of Lords in Westminster Hall when making state visits to Britain.

No, actually it isn't. It has happened once and only once.

Bercow's comments certainly make this a deliberate snub - but something should not be described as a custom so readily.

[NorthMountain]

Ronald Reagan, Slick Willy, and Barry Soetoro.