How do the 'midterms' work in the U.S. and why are they crucial for Trump?

On November 3, Americans will vote in midterm elections, renewing the entire House of Representatives and one-third of the Senate. These elections serve as a gauge of Donald Trump's governance. Currently, Republicans hold narrow majorities in both chambers. Democrats need to gain four seats to take control of the House, which is more feasible than in the Senate. Key battleground states include Maine, North Carolina, and Ohio, where both parties aim to flip seats. Polls suggest Republicans may lose the House but retain the Senate, leading to potential legislative gridlock. Results may take time to finalize, especially in competitive states like Georgia, but initial outcomes could indicate Trump's legislative power for the remaining term.