South Africa chose "Solidarity, Equality, Sustainability" as the theme of its presidency of the G20, which comprises 19 countries and two regional bodies.
Negotiations at COP30 climate talks in Brazil ran into overtime on Saturday with no agreement struck and delegates still locked in a bitter fight over whether to mention fossil fuels in the final text.
In recent weeks, renewed public furore over the so-called Epstein files has consumed US politics, spurring a showdown between lawmakers and Trump, a former friend of the late convicted sex offender.