The United States is not taking part in this weekend’s G20 summit in Johannesburg, the White House said on Thursday, denying earlier comments from South Africa’s President Cyril Ramaphosa, who had said Washington wanted to take part. “The United States is not participating in official talks at the G20 in South Africa,” White House Press Secretary Karoline Leavitt told reporters. “I saw the South African president running his mouth a little bit against the United States and the president of the...