Former Secretary of State Hillary Clinton and businessman Donald Trump stepped on stage Monday night for the first presidential debate. The ensuing 90 minutes left fact checkers with plenty to scrutinize.

The New York Times had 18 fact checkers on the job, and Politifact more than a dozen. Here are some of the claims, both true and false, from the debate at Hofstra University.

Here are the seven most talked about fact checks from the debate:

Climate change is a Chinese hoax

Early in the debate, Trump denied claiming that the Chinese invented climate change as a way to hurt the U.S. manufacturing industry. Clinton lobbed the accusation, and Trump declared he did not say it. But Twitter says otherwise. In November 2012, the businessman tweeted just that. Despite some suggestions that his campaign deleted the telling tweet, it stands.

The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive. — Donald J. Trump (@realDonaldTrump) November 6, 2012

Politifact noted in its fact check that Trump has since said the remark was a joke, but that the candidate has a history of referring to climate change as a hoax.

The Trans-Pacific Partnership is the 'gold standard'

Trump accused Clinton of flip flopping on support for the Trans-Pacific Partnership, a trade deal she now says she opposes. Trump reminded viewers that Clinton once called the TPP the "gold standard" of trade deals.

Clinton on Monday said she'd "hoped" the TPP would be the gold standard, but when it was ultimately negotiated, she could not support it. She similarly tried to distance herself from the trade deal in a primary debate.

But, according to Politifact, Clinton only later added that she had high hopes for the agreement.

In 2012, she said this: "This TPP sets the gold standard in trade agreements to open free, transparent, fair trade, the kind of environment that has the rule of law and a level playing field."

The New York Times reported that "Mrs. Clinton spoke out more than 40 times in favor of the trade deal."

Trump's tax plan would "blow up the debt"

Clinton tried to brand Trump's tax proposal "Trumped-up trickle down economics," and said it would add trillions of dollars to the debt.

"Independent experts have looked at what I've proposed and looked at what Donald has proposed. And basically they have said this -- that if his tax plan, which would blow up the debt by over five trillion dollars," she said.

The Committee for a Responsible Federal Budget has estimated that Trump's tax plans would boost the federal debt by a net $5.3 trillion over 10 years. The organization said it based its projections on what was known about the candidates' proposals as of Sept. 21.

The total $5.8 trillion in revenue loss includes $1.45 trillion from individual tax reform, $2.85 trillion from business tax reform and $1.2 trillion from repealing the taxes imposed by the Affordable Care Act, according to the group. Taking into account $1.2 trillion in reduced spending and $700 million in increased interest, the tax plan costs about $5.3 trillion, the group estimated.

Another group, the Tax Foundation, said Trump's plan would eliminate $4.4 trillion to $5.9 trillion in revenue.

Team Clinton started the birther claims

Moderator Lester Holt asked Trump to explain why he no longer doubts that Obama was born in America. Trump did not answer the question but he repeated the charge that Clinton's 2008 campaign first raised the question.

Politifact says it found no evidence Clinton's campaign was the catalyst for the debate.

"A reporter has claimed that Sidney Blumenthal, a Clinton advisor, urged him to look into Obama's birthplace in the heat of the Democratic primary in 2008. But Blumenthal denies this so it's one man's word against another's. Furthermore, we found new evidence that the founding father of birtherism was actually a prolific anti-Muslim blogger who floated the theory in right-wing forums."

Factcheck.org also debunked the statement, finding no ties to Clinton's campaign.

Who was responsible for the North America Free Trade Agreement?

"Your husband signed NAFTA, which is one of the worst trade deals anywhere...Nothing will ever top that," Trump said in an attack on Clinton.

Actually, NAFTA was "negotiated and signed by President George H.W. Bush, although though Bill Clinton was a strong proponent and won congressional approval for the deal," according to the Washington Post.

According to the nonpartisan Congressional Research Office, NAFTA did not trigger massive job losses, nor did it do much to boost the economy, NPR reports.

New York City Police Department's 'Stop and Frisk' is constitutional

Trump pledges to implement the stop and frisk strategy of policing across the nation to control violent crime. He denied it was ruled unconstitutional, but Holt interjected that it was struck down. Trump disagreed again.

"It went before a judge who was a very against-police judge. It was taken away from her and our mayor, our new mayor, refused to go forward with the case," Trump said. "They would have won an appeal."

CNN pointed out no one knows what would have happened had Mayor Bill DeBlasio appealed the decision, but he didn't.

Crime in New York City is ...

The debate over stop-and-frisk led to a disagreement over the trajectory of crime in New York City. Trump said the murder rate is up, Clinton said it's down. According to The New York Times, citing police department data, the numbers are on the former senator's side.

"Crime statistics show that murders are down year on year, to 246 from 257," The Times said.

Susan K. Livio may be reached at slivio@njadvancemedia.com. Follow her on Twitter @SusanKLivio. Find NJ.com Politics on Facebook.