Closing Bell: Disney Eyes Twitter Buyout; U.S. Stocks Decline Ahead of Debate

U.S. stocks ended near lows as Wall Street grew restless ahead of the first presidential debate. The polls show Hillary Clinton's lead over Donald Trump has tightened in recent weeks. Crude oil prices rallied as major oil producers convened at the three-day International Energy Forum. Traders hope attendees can agree on a production freeze as a solution to the current oil crisis. Oil prices have lost more than 50% of their value over the past two years. Mylan (MYL) - Get Report fell even after reiterating that it receives just a fraction in profit from the sale of its EpiPen. Reports emerged earlier that the drugmaker had understated profits tied to the life-saving device when testifying before Congress last week. Disney (DIS) - Get Report slid on reports it is mulling a bid for Twitter (TWTR) - Get Report . The world's largest entertainment company is just the latest with rumored interest in the social network.