These are the stocks posting the largest moves before the bell.Market Insiderread more
An oil processing facility at Abqaiq and the nearby Khurais oil field was attacked on Saturday.Marketsread more
"There is reason to believe that we know the culprit," Trump said in a post on Twitter.Politicsread more
An extended Saudi oil outage could push Brent crude prices north of $75 per barrel, Goldman Sachs warned clients.Marketsread more
As investors worry about oil supply, airline and cruise ship stocks are getting hit on Monday, while some energy stocks are shooting upward.Marketsread more
The trucking industry is worth hundreds of billions of dollars per year. Uber is going after this market with Uber Freight, an online platform that matches truckers with...Technologyread more
Brent crude surged by as much as 19.5% to reach $71.95 per barrel on Monday, the biggest intra-day jump since the Gulf War in 1991.Oilread more
U.S. stock futures are under pressure Monday as oil prices spike after Saturday's coordinated strikes on key Saudi oil interests.Marketsread more
In the past few weeks, the S&P 500 has waged a 6% rally, pulling within 1% of its late-July record high by Friday's close.Trading Nationread more
The strike, depending on its length, could easily cost GM hundreds of millions of dollars. The last time the union declared a strike at GM was in 2007.Autosread more
Saudi Aramco has 35-40 days of supply to meet contractual obligations, a source close to the matter told CNBC.Energyread more
The event at Washington University in St. Louis follows a first debate late last month in which Trump seemed at times agitated and unprepared. His ensuing public spat with a former Miss Universe whom Clinton brought up at the debate, including an overnight insult-ridden tweet storm, compounded what turned into a rough stretch for the Republican candidate.
Trump on Sunday will once again seek to assure the tens of millions of viewers that he can control his bombastic tendencies and effectively discuss policy. Clinton will likely look to keep Trump off balance and avoid any major gaffes that could reverse the recent polling shift in her favor.
Clinton's average lead in recent national polls featuring third-party candidates Gary Johnson and Jill Stein has grown to 3.5 points, up from 1.6 points on the day of the first debate. She leads in an average of recent polls in swing states Colorado, Florida, New Hampshire, North Carolina, Pennsylvania and Virginia, at least one of which Trump would have to win to take the White House. Trump has a recent advantage in Iowa and Ohio.
A strong showing in the debate could certainly give Trump a boost. A record of more than 80 million people watched the first debate at Hofstra University, and Sunday's could also draw a huge audience.
It will feature a town hall format, different from the first in which the candidates fielded questions on stage from NBC News anchor Lester Holt.
It remains to be seen whether Trump comes into Sunday more prepared or looks more comfortable in the town hall format. He held a town hall event in New Hampshire on Thursday night, which he insisted was not preparation despite it featuring a timer on his answers. He fielded relatively easy questions from conservative radio host Howie Carr.
Sunday's debate also follows a vice presidential debate in which most commentators said Trump's running mate Mike Pence got the better of Clinton's running mate Tim Kaine. Pence deflected consistent attacks on Trump from Kaine, though he denied Trump said some statements he made in the past and avoided defending some of Trump's most outrageous remarks and policies.
However, multiple reports indicated that Trump felt upstaged by Pence's debate success after his own struggles.
Focus on Friday has shifted away from politics, as a potentially devastating hurricane bears down on Florida.
Watch the full debate and CNBC's analysis at CNBC.com starting at 9 p.m. ET on Sunday.