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. Nathan Howard | ReutersTraders slashed odds that the Supreme Court will uphold President Donald Trump’s aggressive tariffs after justices on Wednesday signaled doubts about the legality of the administration’s sweeping trade powers.On Kalshi, contracts tied to whether the court would rule in favor of Trump’s tariffs slipped to around 30%…