-
Now Playing: Tillerson: Trump 'wanted to be clear' to North Korea
-
Now Playing: North Korea threatens missile strike on Guam that will create an 'enveloping fire'
-
Now Playing: North Korea promises 'thousands-fold' revenge against US over sanctions
-
Now Playing: Democrats questioning deals made during Trump-Kim summit
-
Now Playing: Trump's personal lawyer likely to work with federal prosecutors: Sources
-
Now Playing: GOP working with Trump White House 'hand-in-glove' on immigration: Ryan
-
Now Playing: The evolving rhetoric between Trump and Kim Jong Un
-
Now Playing: GOP is becoming 'a cultish thing,' Republican senator says
-
Now Playing: Mark Sanford loses in South Carolina after rebuking Trump
-
Now Playing: Incumbent Mark Sanford loses SC primary to Katie Arrington
-
Now Playing: Images of the historic meeting between Donald Trump and Kim Jong Un
-
Now Playing: Donald Trump one-on-one with George Stephanopoulos
-
Now Playing: Trump insists on stopping the 'war games'
-
Now Playing: Trump and Kim Jong Un making history with their goals to denuclearize Korean Peninsula
-
Now Playing: 'We might poke the bear!': GOP senator rants against colleagues
-
Now Playing: Trump and Kim Jong Un declare intentions to denuclearize Korean Peninsula at summit
-
Now Playing: Republican senators react to Trump's historic summit with Kim Jong Un
-
Now Playing: Democratic senators react to Trump announcing end to military exercises with S Korea
-
Now Playing: When is Kim Jong Un coming to the White House?
-
Now Playing: Trump explains what happened at the G7 summit