Stocks slumped to session lows on Tuesday as uncertainty over when and how the Trump administration will implement regulatory reform spooked the financial sector.

The S&P 500 was down 1%, the Dow Jones Industrial Average fell 0.9%, and the Nasdaq slid 1.5%. Stocks were on track to post their largest daily losses of the year. The S&P 500 has not declined by 1% in 109 sessions. Defensive utilities and consumer staples stocks were the only sectors in the green on Tuesday. 

The financial sector was one of the worst performers on Tuesday, continuing its decline from a day earlier. Bank of America (BAC) - Get Bank of America Corp Report , JPMorgan (JPM) - Get JPMorgan Chase & Co. (JPM) Report , Wells Fargo (WFC) - Get Wells Fargo & Company Report , and Citigroup (C) - Get Citigroup Inc. Report declined, while the Financial Select Sector SPDR ETF (XLF) - Get Financial Select Sector SPDR Fund Report dropped 2.6%. 

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Banking stocks spiked in the aftermath of the election on promises from Donald Trump and his administration that financial rules and regulations would be relaxed. The markets have grown restless the longer the Trump White House goes without a hint of a reform plan. 

"There's a degree of uncertainty over the extent and magnitude and timing of any regulatory reform that the Trump administration plans to put forward -- so far they've just punted," Cathy Seifert, director of financial institution research at CFRA Research, said in a phone call. "If [health care reform] is an indication of how regulatory reform is going to go, we've got a lot of headaches ahead of us."

Trump headed to Capitol Hill on Tuesday for a closed-door meeting to pressure House Republicans to vote for his Obamacare repeal and replace bill. Trump reportedly told lawmakers that their seats would be on the line in 2018 if they did not back the bill.

House Republicans are set to vote on the American Health Care Act on Thursday. Speaker Paul Ryan's bill, designed to replace the Affordable Care Act, has been widely criticized on both sides of the aisle. The Congressional Budget Office calculated that 24 million more people will be uninsured by 2026 under the Republicans' bill, including 14 million more by 2018. Premiums are expected to jump 20% in the individual market in 2018 and 2019.

The basic materials sector was also sharply lower on Tuesday. Industry leaders including BHP Billiton (BHP) - Get BHP Group Ltd Sponsored ADR Report , Rio Tinto (RIO) - Get Rio Tinto plc Sponsored ADR Report , Vale (VALE) - Get Vale S.A. Sponsored ADR Report  and LyondellBasell (LYB) - Get LyondellBasell Industries NV (LYB) Report were all sharply lower, while the Materials Select Sector SPDR ETF (XLB) - Get Materials Select Sector SPDR Fund Report fell 1.2%.

Stocks had posted modest gains when markets opened Tuesday with the Nasdaq even reaching intraday records. Markets had mostly been stuck in a holding position since a big rally last week following the Federal Reserve's decision to hike rates. 

"Since hitting new highs on March 1 the indices have done little," said James "Rev Shark" Deporre in his column for RealMoney, our premium site for investors. "There was a brief flurry of buying following the Fed interest rate decision last Wednesday, but it has been very sloppy action within a tight trading range ... The bullish spin on this dull action is that it is healthy consolidation that is a set up for another thrust higher."

Apple (AAPL) - Get Apple Inc. (AAPL) Report  fell but touched new record highs earlier Tuesday after announcing the launch of its 9.7-inch iPad and a special "red" edition of its iPhone 7 and iPhone 7 Plus. Apple's "red" products are part of its campaign to raise funds for the fight against AIDS. The special edition smartphones will be available in stores on March 24. 

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Crude oil prices fell on Tuesday after settling at a near one-week low a day earlier. Prices have been under pressure on signs of ballooning U.S. stockpiles and an uptick in global production. Weekly data on Friday showed another increase in oil-drilling rig activity in the U.S.

West Texas Intermediate crude slid 1.8% to $47.34 a barrel on Tuesday.

"Crude oil prices are still suffering from its last technical breakdown, from which it will take a bit more time to recover," said Peter Cardillo, chief market economist at First Standard Financial. "Despite increasing levels of domestic production, we continue to see a rebalancing of the market in the second half of the year with prices trading between $60 and $65."

The economic calendar does not heat up until later in the week. Existing home sales for February will be released on Wednesday; new home sales for February are set for Thursday; and durable goods orders for February are scheduled for Friday.

The second day of confirmation hearings for Neil Gorsuch to serve as the nation's 113th Supreme Court justice are underway Tuesday. Hearings began late Monday morning. In an unprecedented move a year earlier, Senate Majority Leader Mitch McConnell and other Senate Republicans refused to hold a hearing for Obama's pick, Merrick Garland, after Justice Antonin Scalia's death that February.

Lennar (LEN) - Get Lennar Corporation Class A Report   reported a better-than-expected quarter driven by healthy demand in the housing market. Net income fell to 56 cents a share from 63 cents a year earlier, though came in a penny higher than anticipated. Revenue of $2.34 billion exceeded estimates of $2.14 billion. Home deliveries rose to 5,433 from 4,806. 

General Mills (GIS) - Get General Mills, Inc. (GIS) Report was slightly lower after sales came in slightly weaker than forecast. The packaged foods company earned an adjusted 72 cents a share, higher than a target of 71 cents, though revenue fell 5.2% to $3.79 billion. Analysts anticipated revenue of $3.82 billion. General Mills anticipates full-year earnings growth between 5% and 7%, more than expected.

READ MORE: General Mills Stock Falls Premarket on Mixed 3Q Results

Campbell Soup (CPB) - Get Campbell Soup Company Report  tumbled after it was downgraded from market perform to underperform at Bernstein. The firm said the company's revenue trends are deteriorating, and it is being hurt by consumers' preference for fresher food. The stock has a price target of $54.

Carnival (CCL) - Get Carnival Corporation Report was upgraded to outperform from market perform at William Blair. Analysts said the company will likely beat earnings estimates as it enjoys favorable trends through this year and next. 

You're Invited...

Wall Street Goes to Washington: In the first of a series of conversations with the President's economic advisors, acclaimed author and columnist Michael Wolff will sit down with Anthony Scaramucci, co-founder of private equity firm Skybridge Capital, to discuss the Trump administration, his thoughts on policies and regulations under debate and his outlook for the next four years. Join us for this cocktail party on Monday, March 27 at The Metropolitan Club in New York. The event is free, but seating is limited and reservations are required. For more information or to RSVP, email