Newt Gingrich, Rudy Giuliani and Reince Priebus are all under consideration for significant roles within a possible Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE White House, according to a new report.

Three campaign advisers to the Republican presidential nominee confirmed Monday that the trio tops a list of options for major posts in a potential Trump administration, NBC News said.

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NBC News reports Trump’s campaign is considering Giuliani, the former GOP mayor of New York City, for the position of attorney general.

Gingrich, who is a former Republican House Speaker, is having his name floated for secretary of State, according to the anonymous sources from Trump’s team.

Priebus, the acting chairman of the Republican National Committee (RNC), is being suggested for Trump’s White House chief of staff.

NBC News said Trump’s team is debating possible transitions more seriously amid tightening polls between the billionaire and Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE.

“It’s become a lot more real,” one campaign adviser said of plotting out a Trump White House the day before Election Day.

NBC News said Priebus is seen as a potential bridge between establishment Republicans and Trump’s populist, grassroots supporters.

A senior Trump adviser cautioned, however, that it remains unclear if Priebus would exit the RNC or if he would be the best fit for dealing with Republicans outside the party’s establishment.

“They’re thinking, ‘We need to find that balance between someone who knows how Washington works and someone who shakes things up,’” they said of the Trump campaign’s deliberations.

NBC News added that retired Army Lt. Gen. Michael Flynn is under consideration for Trump’s Defense secretary or national security adviser, while Trump finance chairman Steve Mnuchin is a possible Treasury secretary pick.

RNC finance chairman Lew Eisenberg is on the Trump campaign’s list for Commerce secretary in a possible Trump administration.

Trump campaign spokeswoman Hope Hicks on Monday denied whispers about the billionaire’s potential Cabinet picks, however.

“None of this is accurate,” she said of NBC News’s report, adding Trump is “entirely focused on the campaign and the American people."