The Group of Seven industrialized nations is an "important framework" for coordination in tackling global challenges, the top Japanese government spokesman said Monday after U.S. President Donald Trump called it "very outdated" and advocated expansion.

Trump said Saturday he wants to invite Australia, South Korea, Russia and India to this year's G7 summit, which has been postponed until the fall, in addition to the existing members including Japan.

"The G7 will continue to be an important framework allowing the participating major countries to jointly tackle global issues and confirm cooperation and coordination," Chief Cabinet Secretary Yoshihide Suga said at a news conference.