The Daily Beast explained that this is because the UK has decided to invite only sitting heads of state and their spouses or partners.
Space constraints are the reason, according to officials.And, as reported by the Independent, foreign heads of state flying to Britain for next Monday's service .
According to Politico, foreign dignitaries would be bused from a location in West London to Westminster Abbey rather than utilising official vehicles.
It is customary for a past president to attend the state funeral of the sitting chief executive, but due to the UK's decision to limit attendance.
Moreover, it puts an end to the wild speculation of media commentators like CNN's Jake Tapper, who said on Friday that it would be "smart" for Biden to invite Trump .
Allowing each country to send a delegation consisting of members hand-picked by the government in power there.