墨西哥总统辛鲍姆：钢铁关税“不公正”且“不可持续”。

Group 1 - The core viewpoint of the article is that Mexican President López Obrador criticizes steel tariffs imposed by the United States as "unjust" and "unsustainable" [1] Group 2 - The article highlights the impact of these tariffs on the steel industry, suggesting that they may lead to increased costs for consumers and manufacturers in Mexico [1] - It also mentions that the Mexican government is considering taking action against these tariffs, potentially through international trade agreements [1]