Investors on edge as debt ceiling talks continue to weigh on stock market.

US stock futures edged higher as investors monitored debt-ceiling negotiations, with the Dow Jones Industrial Average futures up by 0.1%. The Treasury Secretary warned of a potential default in early June, and even if the debt ceiling is raised, markets could be affected. Investors will also be watching for the minutes from the Federal Reserve's meeting earlier in May and earnings announcements from American Eagle Outfitters and Nvidia. Tax refunds were lower this spring than last, affecting companies' quarterly results, while copper is on track for its worst month since June 2022.