The White House expressed optimism on Tuesday night as results began to roll in from House and Senate races that indicated a so-called blue wave for Democrats might not materialize.

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Sanders credited Trump for closing the deal for Indiana GOP Senate candidate Mike Braun and other candidates who embraced him during their campaigns.

"So far, most of the races where the president has gone in, those candidates are doing extremely well," she said.

She also cautioned Democrats against launching widespread investigations of Trump if they take control of the House, suggesting that would be a misreading of the political environment.

"We have a president that’s willing to work across the aisle to get things done," she said earlier on Fox News. "We feel good about where we are in the Senate, but if Democrats take the House, they shouldn’t waste time investigating, they should focus on what the people put them there to do."

Trump is taking in the results at a watch party inside the White House with family members, major donors and supporters.