Investing.com-- The S&P 500 closed lower Monday as traders opted for caution ahead of the presidential election and the Federal Reserve's rate decision later this week. 

At 4:00 p.m. ET (2100 GMT), the Dow Jones Industrial Average dropped 257 points, or 0.6%, the S&P 500 index slipped 0.3%, and NASDAQ Composite fell 0.3%.

Trump, Harris set for tight presidential race

Investors were largely on edge before presidential elections on Tuesday, with recent polls showing Donald Trump and Kamala Harris were set for a tight race.

Recent increases in the dollar and Treasury yields showed some investors were positioning for a Trump victory, which is expected to result in more inflationary policies.

Analysts indicating that the outcome could significantly impact the market performance, especially the Big Tech sector.

Specifically, according to Wedbush analysts, a potential Trump victory is causing concern among global tech investors due to the possible escalation of the US-China tech conflict and increased tariffs.

“A major change in tariffs and a harsher stance on China we believe would significantly impact the supply chain, Nvidia (NASDAQ:NVDA), Beijing retaliatory impacts on Apple/Tesla likely, and slow the pace of the AI Revolution,” analysts led by Dan Ives said in a note.

NVIDIA Corporation (NASDAQ:NVDA), meanwhile, is set to join the Dow Jones Industrial Average on Friday, replacing struggling chipmaker intel.  

The quarterly earnings season is set to continue, with around a fifth of the companies in the benchmark S&P 500 due to unveil their latest quarterly earnings this week.

Earnings season continues 

Berkshire Hathaway Inc Class A (NYSE:BRKa)'s weaker than expected Q3 operating earnings totaled of $10.1B in the third quarter missed analyst forecasts, sending the stock more than 2% lower.

Marriott International (NASDAQ:MAR) stock fell 1.6% after the hotel operator cut its annual profit forecast, as domestic travel demand in the U.S. and China remains weak.

Viking Therapeutics (NASDAQ:VKTX) stock gave up gains to trade 13% lower as concerns about the drug maker's ability to mass produce its oral weight-loss drug offset better-than-expected results from a Phase 1 trial.

Fed set to cut interest rates

Focus this week is also on a Fed meeting, with the central bank widely expected to cut interest rates by 25 basis points after a 50 bps cut in September.

Markets will be watching for any commentary from the Fed on its plans for future rate cuts, especially in the light of recent data showing resilience in the U.S. economy and stickiness in inflation, which dampen the outlook for lower rates.

"We expect that the FOMC will deliver a 25 bp cut next week, and the focus will be on potential statement changes and the press conference with Chair Powell," UBS said in a recent note.

But Fed Chair Jerome Powell is unlikely to commit to any set pace of monetary easing, given that the central bank has so far maintained a data-driven approach to policy.

Still, the meeting comes after nonfarm payrolls data on Friday showed job growth slowed sharply in October, with a downward revision in readings for the past two months indicating that the labor market was cooling.

(Peter Nurse, Ambar Warrick contributed to this article.)