All 435 House seats and 35 Senate seats are at stake, alongside governorships in 36 states, making the midterm elections a major test of political control. (EPA Images pic)WASHINGTON: Americans deliver their verdict on Donald Trump's tumultuous second presidency Tuesday in midterm elections that threaten to shatter his grip on Washington, with Democrats poised to seize the House and challenge for control of the Senate.

Republicans losing the House would give Democrats the power to stall Trump's legislative agenda and launch sweeping investigations of his administration. A Senate defeat would also threaten his ability to appoint Supreme Court justices and senior officials.

The election amounts to a nationwide judgment on Trump, with the mood turning sharply against Republicans amid anger over soaring living costs and the war against Iran.