Boris Johnson’s plan to host an expanded Group of Seven summit in June is worrying some other members who fear the U.K. may be trying to reshape the forum of wealthy nations via the back door.

The British prime minister has invited South Korea, India and Australia as guests to this year’s meeting as he tries to establish a so-called D-10 coalition of democracies to counter China and other authoritarian states. Johnson wants to champion global action and democratic values, and project the U.K. as a force for good after leaving the European Union.

While it is standard practice for a G7 host to invite more countries to the summit, the involvement of guest nations is typically limited. According to a person familiar with Johnson’s plans, that will change this year with the three countries set to take part from the get-go, from preparatory meetings of the leaders’ diplomatic emissaries early next month through to ministerial gatherings before the summit.