Donald Trump is ahead of Hillary Clinton by 1 point in the ABC News/Washington Post national tracking poll released Tuesday. It is the first time the GOP nominee has led that survey since May.

The poll, conducted between Oct. 27-30, showed Trump leading Clinton by 1 point at 46 percent to 45 percent, with Libertarian candidate Gary Johnson and Green Party candidate Jill Stein taking just 3 and 2 percent, respectively. Just one week earlier, Clinton was trouncing Trump by 12 points in the ABC News/Washington Post survey.

“This poll is the first major sign that the October/November surprise from the FBI is going to have never-before-seen effects on the election.”

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The poll, which surveyed 1,128 likely voters, points to major movement in the race in the aftermath of the FBI’s bombshell Friday revelation that it had reopened its investigation into Clinton’s use of a private server during her tenure as secretary of state.

“This poll is the first major sign that the October/November surprise from the FBI is going to have never-before-seen effects on the election,” Eddie Zipperer, an assistant professor of political science at Georgia Military College, told LifeZette in an email.

As the FBI’s announcement continues to generate media coverage and fuel attacks from Clinton’s political adversaries, Clinton could suffer even further losses in the polls — both in sheer numbers and in enthusiasm among her supporters.

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The most recent poll found that enthusiasm for Clinton’s candidacy among her supporters trailed the excitement among backers of the GOP nominee by 8 points.

“As well as leading the poll by 1, it’s also very significant that Trump is up 8 points among those who are very enthusiastic about their choice,” Zipperer added. “Polls tend to slightly underestimate the candidate with more enthusiastic voters.”