Here's everything you need to know before Tuesday's opening bell:
Donald Trump and Kim Jong Un signed a "comprehensive" agreement to continue discussions to denuclearize the Korean Peninsula.
The White House said Larry Kudlow was in "good condition" after experiencing a "mild" heart attack.
Judge Richard Leon will issue his ruling on AT&T proposed $85 billion acquisition of Time Warner .
McDonald's is expected to detail changes to its organizational structure in the U.S.
U.S. stock futures traded lower.
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