Even before he landed in Rio de Janeiro for Brazil’s Group of 20 summit, Argentina’s Javier Milei had already started raining on President Luiz Inacio Lula da Silva’s big party.

Argentine diplomats have thrown a wrench into last-minute talks meant to reach consensus on the communique that world leaders are set to sign Tuesday, according to multiple government officials from various G20 nations. They even began backing off support for ideas they had previously signed off on in previous meetings, including a tax on billionaires, the people said.

In the end, negotiators managed to salvage the draft communique by adding a footnote saying that Argentina doesn’t agree with some of the points, four officials said, requesting anonymity because the statement isn’t yet public.