U.S. stocks opened lower Monday as Wall Street digested comments from New York Federal Reserve President Bill Dudley.

Dudley said Monday morning that the Fed is on track to gradually raise interest rates given factors depressing inflation are "fading" and the U.S. economy's fundamentals are sound, according to CNBC, an American business news channel.

Chicago Fed President Charles Evans and Minneapolis Fed President Neel Kashkari will make speeches later on Monday.

Overseas, the German elections were in focus. The conservative union led by German sitting Chancellor Angela Merkel on Sunday defended its commanding role in the Bundestag (German parliament) with 32.5 percent of the vote, falling short of expectations with a 9-percentage-point gap compared with the election four years ago.

Shortly after the opening bell, the Dow Jones Industrial Average fell 17.40 points, or 0.08 percent, to 22,332.19. The S&P 500 lost 2.99 points, or 0.12 percent, to 2,499.23. The Nasdaq Composite Index dipped 24.23 points, or 0.38 percent, to 6,402.70.

U.S. stocks ended mixed on Friday, as rising geopolitical tensions between the Democratic People's Republic of Korea (DPRK) and the United States weighed on the market.