WASHINGTON — Control of Congress hangs in the balance as Americans head to the polls Tuesday to vote in a historic set of midterm elections that will determine how power is divided for the rest of President Donald Trump’s time in office.

A robust turnout appeared possible, after months of polls suggesting voters’ frustration with cost-of-living issues may drive them to the polls. More than 59 million Americans had already cast ballots in early voting, according to the University of Florida Election Lab.

The campaign has largely been marked by Democrats’ unexpected traction in red states, resulting in Senate races that have been far more competitive than anticipated. Whether that translates into losses for Republicans could become a nail-biter Tuesday night.

Polling shows Democrats poised to make significant gains in the U.S. House and well-positioned for swing Senate races, but analysts say the Senate majority could go either way. Several gubernatorial seats are also open, and some contests have become unexpectedly close, including in Georgia, Kansas, Texas and Florida.

Eyes will be on a handful of bellwether House races as the polls begin closing, with a Kentucky district expected to be the first to offer clues as to how good a night it may be for Democrats.

For weeks, the midterms have appeared poised to deliver a referendum on Trump’s second term and the state of the economy. Americans’ approval of the president has sunk to historic lows as they have cited concerns about affordability, corruption and immigration as driving factors for their votes.

On Monday and over the weekend, candidates made their final pushes to persuade voters.

Democrats, hoping to clench voter support for a “blue wave,” hammered home their arguments about affordability, corruption and the perceived toll of Trump’s governance, aiming to sway non-Democratic voters.

“This election is a battle between the powers that be and the powers that ought to be,” Democratic Senate nominee James Talarico of Texas said at a Sunday night rally. “We are standing with the powers that ought to be — the teachers and the nurses, the farmers and the ranchers, the grandmother who is facing eviction.”

Republicans, anticipating losses in the House, focused on delivering dire warnings to voters about Democratic candidates, whom they have portrayed throughout the campaign as extreme, dangerous and in some cases a threat to the American way of life.

“This race is about defending our state and our country, but it’s also about safeguarding our way of life,” Texas Atty. Gen. Ken Paxton, the state’s Republican nominee for Senate, said Sunday. “Texas has never been this close to slipping away. We’ve never been this close to losing everything that we hold dear — our jobs, our livelihoods, our way of life.”

As voters cast ballots Tuesday, the Justice Department’s election monitors fanned out at polling sites across the country. Thousands of volunteers nationwide were also mobilized to be poll monitors, a backlash to the idea of potential federal election interference.

Trump sent out a flurry of last-minute social media endorsements for Republican congressional candidates and called in to the “Fox and Friends” show to make a final case. Democratic candidates dropped last-minute ads urged voters to head to the polls.

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