Congressman-elect George Santos should resign.

Not on Jan. 3, when the new Congress is sworn in and he can cast a vote to help determine the next speaker of the House of Representatives.

Not later this week as more instances inevitably surface of how he lied about his professional background, educational history and property ownership in defeating Democrat Robert Zimmerman to represent the 3^rd Congressional District in November.

No, Santos should resign immediately.

Before voters in northern Nassau County and northeast Queens can be further embarrassed by the fraud he committed in winning a seat in the House.

How do we know that Santos lied repeatedly over the course of two congressional campaigns?

He admitted he lied, but insisted on calling it something else.

“My sins here are embellishing my résumé,” Mr. Santos told The New York Post in one of several interviews he gave on Monday.

Embellished? The word is lied. Over and over.

Santos told interviewers Monday he lied about working for Citigroup and Goldman Sachs. He lied about graduating from Baruch College and New York University.

“I didn’t graduate from any institution of higher learning. I’m embarrassed and sorry for having embellished my resume,” he said. “I own up to that … We do stupid things in life.”

He lied about forming Friends of Pets United, an animal rescue group as a tax-exempt organization.

He lied in saying he had a family-owned real estate portfolio of 13 properties. He also lied that he owned “a mansion” on Tiffany Lane in Oyster Bay Cove and “a mansion” on Dune Road in the Hamptons,

He lied in claiming he lost four employees at the Pulse nightclub shooting in 2016. He said Monday the four people were not yet employees but instead were in the process of being hired.

He lied that he was an “American Jew,” while also saying he was religiously a Catholic. But he said, he considered himself “Jew-ish.”

Santos, who ran for the House as the first openly gay Republican, also acknowledged a years-long marriage he had never disclosed.

“I dated women in the past. I married a woman. It’s personal stuff,” he said to The Post, adding that he was “OK with my sexuality. People change.”

Then, again, perhaps the marriage was a sham.

Santos also acknowledged that a string of financial difficulties had left him owing thousands to landlords and creditors that resulted in his being evicted twice.

Perhaps even more concerning than the lies Santos has admitted are questions still unanswered about his finances.

Santos reported an income of $55,000 in his unsuccessful 2020 race for Congress against Tom Suozzi.

But in 2022, he claimed a $750,000 salary and over $1 million in dividends from his “family firm,” the Devolder Organization, in financial disclosure forms.  He said earned the salary and dividends by managing $80 million in assets at Devolder.

He did lend his campaign more than $700,000 during the midterm election and donated thousands of dollars to other candidates in the last two years, according to campaign finance forms.

But his 2022 congressional financial disclosure did not reveal any of the Devolder organization’s clients. That is an omission that could be a violation of election law. It also raises questions of just who his clients were. If there are any.

The Devolder organization was formed after the Securities and Exchange Commission accused Harbor City Capital, Santos’ alleged most recent employer, of operating a $6 million Ponzi scheme.

Santos was named Harbor City’s New York regional director in June 2020 but was not named in the complaint filed by the SEC in April 2021.

Data obtained by Blank Slate Media from the Federal Election Commission reveals that in 2022 the Republican received nearly $30,000 in campaign donations from Andrew Intrater, the cousin of Russian oligarch Viktor Vekslberg, an ally of Russian President Vladimir Putin.

The oligarch’s $90 million, 255-foot yacht was seized by the Spanish government in April at the order of the United States. The U.S. Department of Justice said the yacht “was subject to forfeiture based on violations of U.S. bank fraud, money laundering, and sanction statutes.”

Is there a connection between the campaign donation and the Devolder organization’s sudden good fortune – if that is even true?

According to Florida business records, Santos was also a manager of a political consulting firm called Red StrategiesUSA, a Florida-based company set up in the weeks after the SEC exposed the alleged Ponzi scam at Harbor City.

Two other Harbor City alumni were listed as authorized managers of Red Strategies, which worked on the QAnon-friendly campaign of Tina Forte, a Republican who unsuccessfully challenged Rep. Alexandria Ocasio-Cortez (D-N.Y.) in the recent election.

Forte’s campaign paid Red Strategies USA $110,000 between June 2021 and December 2021 for “digital consulting and fund-raising,” according to campaign finance records.

Santos Monday also denied committing a crime anywhere in the world, even though The Times had uncovered Brazilian court records showing that Santos had been charged with fraud as a young man after he was caught writing checks with a stolen checkbook.

State Attorney General Letitia James said she has started her own investigation into Santos following the publication of a blockbuster New York Times story detailing many of his campaign falsehoods.

Calls have also come from many, including Nassau County Legislator Josh Lafazan that the federal government should launch an investigation.

We suggest they look for possible campaign finance fraud, conspiracy to defraud the United States and filing false statements to the FEC.

Decency, respect for the public and good governance would call for Santos to resign before he further damages the trust of the 3^rd Congressional District.

But Santos said he had no intention of stepping down, dismissing concerns that his lies will impact his effectiveness in representing New Yorkers in the lower chamber in the new year.

“I campaigned talking about the people’s concerns, not my resume,” Santos told The Post.

“I intend to deliver on the promises I made during the campaign — fighting crime, fighting to lower inflation, improving education,” he added, saying that “the people elected me to fight for them.”

Could House Republicans, who take control on Jan. 3, block Santos from taking office? Or launch an investigation immediately afterward? Perhaps, but the chances of that happening are slim to none.

The New York Post had reported earlier that Santos’ professional biography became a “running joke” among senior House Republicans. But they did nothing.

And consider that Santos is about to be sworn in to a Congress where a majority of his fellow Republicans supported President Trump’s attempt to overturn the 2020 presidential election by not certifying the vote – after a mob attacked the U.S. Capitol on Jan. 6.

This was based on the Big Lie – the false claim pushed by the twice-impeached president who was found to have lied thousands of times about his business care

Santos himself was quoted as saying he was “at the Ellipse on Jan. 6,” the day of rioting at the U.S. Capitol, and that he “wrote a nice check for a law firm” to aid the rioters who stormed the building.

He has already announced that he would cast a much-needed vote for Kevin McCarthy in his bid to become the next speaker in a House held by Republicans with a razor-thin margin.

Perhaps some fellow Republicans in Nassau and Queens will join with Democrats to speak up against Santos being seated.

Joseph G. Cairo Jr., chairman of the Nassau County Republican Party, told The Times that the allegations raised in its initial story were “serious” issues that he believed Santos should address.

But so far no other local Republican has spoken up – just as none has called for Trump to give up a run for president despite the Jan. 6 committee’s overwhelming evidence of criminal conduct against the former president.

Which begs the question: Is the bar really so low for Nassau Republicans for someone to represent Nassau voters in Congress?

We hope not. We hope Nassau Republicans join Democrats in calling for Santos to resign. Now.