(250612) -- WASHINGTON, June 12, 2025 (Xinhua) -- U.S. President Donald Trump speaks during a signing ceremony at the White House in Washington, D.C., the United States, on June 12, 2025. Trump moved on Thursday at a White House signing ceremony to eliminate California's nation-leading vehicle emissions standards, upending the strict rules that had become a template for states across the nation to realize their greenhouse gas ambitions. (Xinhua/Hu Yousong)