They’re with horror.

(James Keivom/New York Daily News)

The likelihood of a President Trump was becoming more of a possibility Tuesday night as the GOP nominee was racking up states and electoral votes.

As Trump distanced himself from Democrat Hillary Clinton, picking up states like Ohio, Texas and North Carolina, his supporters at his celebration party at the New York Hilton in Midtown began anticipating what once seemed impossible to so many others — he could win.

Two big-screen televisions blasted Fox News Channel, and every time its commentators announced that two swing states were still too close to call, the room erupted in cheers.

39 photos view gallery Election Night 2016: Joy and despair as the results come in

The crowd began chanting “President Trump” when Utah was called for the Republican.

“It’s been so exciting watching these things come in — reminds me of the Reagan elections, where undecided voters come in to the party,” said former Arizona Gov. Jan Brewer, a Trump surrogate.

Trump supporters erupt as the GOP nominee takes Utah.

Across town at Clinton’s party at the Jacob Javits Center, Clinton supporters grew sullen and nervous as the TV networks declared more and more states for Trump.

Clinton operatives who’d happily held court with the press early in the night suddenly were nowhere to be found, or paced nervously while talking on the phone, waving off reporters.

Hillary Clinton and her supporters are in shock as a Trump win becomes increasingly likely.

The mood continued to plummet as the night wore on. Clinton backers looked shell shocked. One low level staffer kept refreshing fivethirtyeight for updates. A young teenage girl cried as her mom talked to reporters.

“Things suck. It’s going to come down to Michigan,” one plugged-in Democrat texted the Daily News shortly before 10 p.m.

A Clinton supporter watches in astonishment at the Democratic candidate’s Javits Center event.

“I’m feeling sick," one Florida Democratic strategist yelled into a phone around 9:30 p.m.

Former Michigan Gov. Jennifer Granholm, a top Clinton ally who has worked on her transition team, sought to calm jittery Dems, arguing that many urban areas were still uncounted and saying she was “mostly confident” Clinton would hang on.

Guests at Clinton’s election night rally watch in stunned silence.

The drama played out all over the streets of New York City as well, as onlookers waited on pins and needles for updates.

"If Trump wins, I’m leaving the country,” said Ellen English, 58, a registered nurse from Detroit, Mich. “I would go live in Ireland. I would become an expatriate. And I have the money to do it."

A pro-Clinton block party in Brooklyn began as a celebration, with kids and adults whooping it up whenever good news for Clinton was announced on CNN.

But as momentum began to shift, the joy turned to worry, shock and panic.

David Griffin, 53, of Roslyn, Long Island, said he voted for Trump and was happy the billionaire developer was pulling ahead.

“Seeing these numbers come in, I see a change to a system that’s broken,” Griffin said, adding that the future of the Supreme Court and other key decisions are at stake.