A protester with the Main Street Alliance holds a sign outside the U.S. Supreme Court, as its justices are set to hear oral arguments on U.S. President Donald Trump's bid to preserve sweeping tariffs after lower courts ruled that Trump overstepped his authority, in Washington, D.C., U.S., November 5, 2025.On Kalshi, contracts tied to whether the court would rule in favor of Trump's tariffs slipped to around 30% from nearly 50% before Wednesday's hearing.Traders slashed odds that the Supreme Court will uphol ...