By Joseph Ax, Nathan Layne and Jason Lange

WASHINGTON, Nov 3 (Reuters) - Democrats were on track to win the US House in Tuesday's midterm elections, according to media projections, and were moving closer to a Senate majority after seizing Republican seats in South Carolina and North Carolina.

The early results were a sweeping rebuke to President Donald Trump and the Republican Congress that has supported him since he returned to the White House two years ago.

In South Carolina, pediatrician Annie Andrews became the first Democrat to win a Senate seat since 1998, a stunning victory over Trump's hand-picked candidate Darline Graham in a state that he carried by nearly 18 percentage points in 2024.

Andrews' win, along with Democrat Roy Cooper's win in North Carolina's Senate race, gave the party two of the four seats it needs to net in order to take control of the chamber. The results also suggested that a Democratic wave was growing large enough to swamp even deeply Republican areas.

After the death of his ally, US Senator Lindsey Graham, Graham's sister Darline was appointed to fill his seat and Trump encouraged her to run for a full six-year term. But her political inexperience proved a liability.

It was still too early to determine whether Democrats would be able to replicate those performances in the other critical races that will determine the Senate majority, including Alaska, Iowa, Michigan, Maine, Ohio and Texas, with millions of votes still uncounted in those states.

Democrats held onto Senate seats in Georgia and New Hampshire, both races that were once considered competitive but moved out of reach for Republicans amid Trump's declining approval ratings.

While several television networks projected that Democrats would eventually win a House majority, most of the chamber's most tightly contested races had yet to be called. So far, Democrats have picked up four seats from Republicans, meaning they can afford to lose one of their existing seats and still take control of the 435-member chamber.

A REBUKE TO TRUMP, WINNER SAYS

"In sweeping and decisive victories, the American people have rebuked the depravity, corruption and incompetence of the man named President Donald J. Trump," incumbent Democratic Senator Jon Ossoff, the projected winner in Georgia, told supporters at a victory party.

In Florida, Republican Senator Ashley Moody fended off Democrat Angie Nixon but was ahead by only about 3 percentage points in a state Trump carried by 13 points in 2024, according to a vote count compiled by Reuters and USA Today, further evidence that even solidly Republican states were shifting dramatically toward Democrats.

Democrats held onto three House districts in Florida that Republican lawmakers had redrawn earlier this year, all of which backed Trump by at least 9 percentage points. The fate of the House overall remained uncertain, with the majority of races still uncalled.

Midterm elections are typically viewed as a referendum on the president, and that is especially true for Trump, who dominates attention like no other politician. Trump himself told his supporters to "pretend I'm on the ballot" and held dozens of rallies in the closing weeks.

According to exit polls conducted by SSRS on behalf of a consortium of US media outlets including major television networks and the Associated Press, half of voters nationwide said they saw the 2026 midterm elections as an opportunity to rebuke the president, and three-quarters said they are "angry" or "dissatisfied" with the way the country is headed.

In addition, 70% of voters surveyed said they want Congress to provide more checks and balances on the president.

History is against Republicans: The sitting president's party has lost ground in Congress in all but two midterms since World War Two. Trump's approval rating is hovering near his career lows, with voters frustrated by war with Iran, higher fuel prices and wider affordability concerns.

Led by Trump, Republicans have portrayed Democratic candidates as radical, un-American and even communist, labels Democrats flatly reject.

Opinion polls show voters are most concerned about affordability and disapprove of Trump's handling of the issue. His tariffs on imports, many of which the courts threw out, and his decision to attack Iran in February raised prices for consumers.

TRUMP DEPLOYS ELECTION MONITORS

There are 47 US House races widely seen as competitive, according to a Reuters analysis of the leading election forecasters. If the other contests all proceed as predicted, Democrats would need to win only 13 of those races to secure a majority.

Legal observers and Democrats have warned that Trump, who has long falsely claimed that US elections are rigged, may attempt to challenge Tuesday's results if Republicans lose.

The US Justice Department said it had deployed 1,000 election monitors and observers to all 50 states in what it called the largest Election Day monitoring effort in history.

Democrats criticized the plan as potential voter intimidation. In roughly two-thirds of the jurisdictions the department listed, voters supported Democrat Kamala Harris over Trump in the 2024 presidential election, a Reuters analysis found.

Election officials in several states reported no issues with the monitoring effort. New Mexico's secretary of state's office said it had received reports of federal monitors asking "unusual questions" in one county and that the Justice Department offered assurances that the conduct would be addressed.

(Reporting by Joseph Ax, Jason Lange, Brad Heath and Dan Rosenzweig-Ziff in Washington and Nathan Layne in Detroit; Additional reporting by Nolan D. McCaskill, Dan Catchpole, Ashraf Fahim, Arafat Barbakh, David Morgan, Mike Spector, Bianca Flowers, Pete Eisler, Doina Chiacu and Humeyra Pamuk; Writing by Joseph Ax and Jonathan Allen; Editing by Paul Thomasch and Howard Goller)