Combined with a strong labor market and record highs in the stock market — the Standard & Poor's 500 index is up 15 percent year to date — the economy is proving to be an ally of a president who is otherwise suffering from unusually low approval numbers and political conflicts. But opinions vary greatly over whether Trump should take credit for the uptick in growth.

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"He gets zero credit because he hasn't done anything. There's been zero change in economic policy," says Mark Zandi, chief economist at Moody's Analytics, a research firm. "This uptick is happening across the globe. It’s not just the U.S."

Conservatives, however, point out that Trump has dramatically scaled back regulations on businesses, which is helping to spur more corporate spending, they argue. Third quarter growth was bolstered by companies beefing up their inventories and spending more on equipment.

"It's striking how much has been done on the regulatory front. It has to matter to the economy," says economist Doug Holtz-Eakin, president of the right-leaning American Action Forum. His organization keeps a tally of how much government regulations costs.

Trump and his allies in Congress are making the case that passing a tax overhaul — which aims to cut income and corporate taxes by $1.5 trillion over a decade — is critical to continuing the economic expansion. House Republicans plan to unveil a bill on Wednesday on the tax code and both chambers plan to pass one by Thanksgiving, an extremely tight deadline for a major piece of legislation.

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“Working with President Trump and the Senate, we will deliver on our tax reform promise this year — ushering in a new era of growth for the American people,” House Ways and Means Committee Chairman Kevin Brady (R-Texas) said in a statement Friday.

Yet the resiliency of the economy also underscores the high-stakes of the effort and what any slowdown in growth, or decline in the stock market, might mean for the president and Republicans politically.

"A good portion of people voted for Trump because they were unhappy with their individual economic plight," says Barbara Perry, director of presidential studies at the University of Virginia’s Miller Center. "They expect their lot in life to improve."

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Few economists expect the economy to continue to expand at a 3 percent pace in coming quarters, given the waves of baby boomers retiring and exiting the workforce. Under President Obama, the economy grew an average of 2.1 percent a year, although he also had many quarters where growth exceeded 3 percent.

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Trump repeatedly promised growth of over 4 percent on the campaign trail, something that hasn't happened consistently since the late 1990s.

“An above-trend quarter does not mean that the trend has picked up,” says Jim O'Sullivan, chief U.S. economist at High Frequency Economics.

Some — including in the White House — argue that the stock market and businesses might already be pricing in a substantial tax cut, meaning failure to deliver could lead to a pullback in performance. In earnings calls this week, over a dozen CEOs of major companies like AT&T and UPS sounded upbeat that Congress will enact a tax package. Some had gone as far as to project how much their earnings would rise next year and what they would do with the extra cash.

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"If we get tax reform that gives us greater access to our offshore cash, that will allow us to invest more in the U.S., and it will also allow us to be able to return more cash to shareholders," said Richard Gonzalez, CEO of drug company AbbVie on an earnings call Friday.

Christopher J. Nassetta, CEO of Hilton, said Thursday that he was “much more optimistic this quarter” that business taxes will go down and that as soon as Congress passes the bill, the benefits will “start to flow through pretty quickly.”

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Trump’s Treasury Secretary Steve Mnuchin recently warned Congress that the stock market would see a “significant” drop if the tax package does not pass. The White House reiterated that message again Friday.

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“Firms are optimistic because of regulatory reform but also because they expect corporate tax reform,” said Kevin Hassett, chair of Trump’s Council of Economic Advisers, on a call with reporters. “The thing I’m worried about is if those expectations prove to be incorrect, I would expect business fixed investment to go back to its disappointing past and markets to go down as well.”

The United States is on track for a history-making expansion. If the current growth cycle lasts until May 2018, as most economists predict, it will be the second longest expansion in U.S. history, according to Lakshman Achuthan, co-founder of the Economic Cycle Research Institute. If it lasts until July 2019, it would surpass the 1991-2001 expansion as the longest.

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“Some people may think we are in the seventh or eighth inning of this expansion, but in the business cycle game, there is no fundamental reason an economic expansion cannot last for 20 innings or longer,” says Achuthan.

There's a heated debate among economists over how much Trump's tax plan, which is being finalized now, will bump up growth. The Trump administration says tax cuts will cause a large uptick, so much so that the economy will grow more than 3 percent a year, which hasn't happened since 2005.

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"I expect the impact on GDP growth will be muted," wrote Megan Greene, chief economist at Manulife Asset Management in a note Friday. She predicts most companies will spend their extra cash on buying back more stock and hiking dividends, a boon to Wall Street that won't do much for Main Street.

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Goldman Sachs forecasts only a modest 0.1 to 0.2 percentage point increase in economic growth if Congress passes the tax reform bill. The Wall Street bank also cautions that growth depends not just on what Congress and the White House do, but also the Federal Reserve. After years of stimulative low interest rates, the Fed is beginning to lift rates, which is akin to tapping the brakes on the economy.

“This tail wind is unlikely to persist as the Fed continues to tighten,” Goldman warned in its weekly kick-start newsletter this week.

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Trump is about to select the next Fed chair, the most powerful economic policy position in the United States. He is currently debating between reappointing current chair Janet L. Yellen, an advocate of low rates to help growth and jobs, or nominating someone like Stanford economist John Taylor, who favors raising interest rates faster.

The leading candidates for the job are Yellen, Taylor and Jerome Powell, who is currently a Fed governor and seen as someone likely to continue many of Yellen's low-rate policies.