US President Barack Obama has said the UK vote to leave the EU raises “longer-term concerns about global growth”.
Before EU leaders warned the UK must honour the principle of free movement of people if it desires to keep use of the single market.
The leaders of the other 27 EU nations were meeting without the UK for the very first time in more than 40 years in Brussels.
Mr Obama was talking with the leaders of Mexico and Canada, aimed at strengthening economic ties between North American nations at a summit in Ottawa.
He said the trainings by central banks and finance ministers indicated that “global economy in the short run will hold steady”.