Factbox-Six things to watch as US voters decide control of Congress

On November 2, American voters will cast their ballots in midterm elections that determine control of Congress for the remaining two years of President Donald Trump's term. The results will serve as the first nationwide verdict on Trump's presidency, revealing whether voters want to check his power by giving Democrats control of one or both chambers of Congress or if they are willing to accept the status quo despite concerns over the cost of living and the US-led war with Iran.

Six things to watch on Election Day include the races that will decide control of Congress, the potential for investigations into the ethics of Trump and his administration, the handling of immigration enforcement and the Iran war, the Republican showing which could reinforce Trump's grip on the party or increase pressure to rethink unpopular policies, the close Senate fight that hinges on six to eight races, and the potential for disputes over voter eligibility, ballot counting, and certification, long lines, machine malfunctions, or challenges by partisan poll watchers.

Trump's Justice Department has deployed about 1,000 monitors nationwide on Election Day, while several states are unlikely to produce complete results on election night, providing fertile ground for disputes.