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On Sunday, September 20, 2026 the most important news topics are:
1. U.S. Supreme Court tariff ruling and aftermath — top political/economic story
•The Supreme Court dealt President Donald Trump a bruising loss on a cornerstone of his economic policy, striking down sweeping tariffs he imposed on nearly every country.
•The nation's highest court struck down some of U.S. President Donald Trump's most sweeping tariffs on Friday, in a 6-3 decision, ruling Trump's attempt to use an emergency powers law to enact the levies was not valid.
•The decision upends a core set of tariffs that Trump rolled out using the 1977 International Emergency Economic Powers Act, or IEEPA, with the court ruling that IEEPA does not authorize the president to impose broad tariffs under national emergency powers.
•Shortly after the judgment, Trump announced a fresh 10% tariff on all imports into the United States, effective Tuesday. He subsequently raised the proposed rate to 15%.
•President Donald Trump said Saturday he is raising a global tariff to 15%, up from 10%, following a Supreme Court decision that struck down most of his second-term trade duties.
•In our news wrap Thursday, a group of states is suing the Trump administration over its planned 15% global tariff, and reporting notes More than 20 states sue Trump over planned 15% global tariff.
•Trump moved swiftly on Friday to replace tariffs struck down by the Supreme Court with a temporary 10% global import duty for 150 days and ordered new investigations under other laws.
2. Middle East — Iran blockade and Houthi escalation
•U.S. Central Command says it will begin a blockade of all Iranian ports at 10 a.m. EDT Monday, or 5:30 p.m. in Iran, to be “enforced impartially against vessels of all nations."
•President Donald Trump wants to weaken Iran’s strategic leverage in the war after demanding that it reopen the strait to all global shipping.
•The two-week ceasefire remains in doubt, and Pakistan, which hosted the talks, says it will seek more dialogue.
•Houthis Say They Targeted Saudi Capital With Ballistic Missiles.
•Houthis say they targeted Saudi capital with ballistic missiles, with reports of flames, smoke seen near Riyadh airport.
3. U.S. Politics — White House press access
•Trump Administration Updates: CNN, Politico And MS NOW Reporters Barred From White House.
•CNN, MS NOW, Politico denied access to White House grounds is among today's top trending stories in the United States.
4. U.S. Foreign Policy — Greenland / Denmark deal
•Denmark And Greenland Say US Military Agreement Will Not Compromise Arctic Territory’s Sovereignty.
•US and Denmark reach deal over Greenland's security after Trump threats.
5. Technology & Economy — AI policy, U.S.-China trade, markets
•Trump To Form ‘AI Force,’ Name AI Czar But Rejects Calls For Constraints.
•Trump to form ‘AI Force,’ name AI czar but rejects calls for constraints.
•US, China Trade Teams Set To Huddle In New York On AI, Iran.
•US, China Trade Teams Set to Huddle in New York on AI, Iran, with U.S. Treasury's Bessent and China's He to meet on Sunday at JPMorgan headquarters.
•Market context: Supreme Court’s decision to strike down President Donald Trump’s tariffs stirred fresh policy uncertainty, further fuelled by worries about a conflict with Iran.
6. Other major events this weekend
•The 2026 World Manufacturing Convention will bring global business leaders, government officials and technology experts to Hefei, Anhui Province, from September 20 to 23.
•From September 19 through October 4, athletes from across Asia will gather in Japan's Aichi-Nagoya region for one of the world's biggest multi-sport events - the Asian Games 2026.
•Russia Reports Online Attacks On Electoral System On Second Day Of Parliamentary Vote.
•Russia reports online attacks on electoral system on second day of parliamentary vote.
These topics — the Supreme Court tariff fallout and market reaction, the Iran blockade and Strait of Hormuz standoff, Houthi attacks on Saudi Arabia, the Greenland security deal, the White House media ban, and the new AI Force and U.S.-China talks — are dominating U.S. and global trending news on September 20, 2026.