Donald Trump to NRA: I will not let you down

Now playing

01:01

Donald Trump to NRA: I will not let you down

Jill Stein electoin recount intv_00000000.jpg

Now playing

01:44

Jill Stein raises millions for recount

Former Democratic US Presidential candidate Hillary Clinton speaks to staff and supporters at the New Yorker hotel after her defeat in the presidential election November 9, 2016 in New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

Now playing

02:14

Scientists urge Clinton to call for recount

LYNDEN, WA - MAY 07: Republican presidential candidate Donald Trump gives a speech during a rally at the The Northwest Washington Fair and Event Center on May 7, 2016 in Lynden, Washington. Trump became the Republican presumptive nominee following his landslide win in Indiana on Tuesday. (Photo by Matt Mills McKnight/Getty Images)

Now playing

03:25

Donald Trump's wild ride

Now playing

01:46

Trump's challenges in the Middle East

donald trump undocumented immigrants crime fact check origwx ty_00013807.jpg

Now playing

02:47

Fact checking Trump on crimes by immigrants

Now playing

01:26

Trump vs. the tape on Obama and the protester

Now playing

01:28

Trump compares Clinton email probe to Watergate

Members of the Secret Service rush Republican presidential candidate Donald Trump off the stage at a campaign rally in Reno, Nev., on Saturday, Nov. 5, 2016. (AP Photo/John Locher)

Now playing

01:20

Donald Trump rushed off stage by Secret Service

donald trump bill belichick letter read rally new hampshire_00021230.jpg

Now playing

02:16

Trump reads letter from Patriot's coach at rally

US Republican presidential nominee Donald Trump speaks during rally at the Atkinson Country Club in Atkinson, New Hampshire on November 4, 2016.

Now playing

01:56

Trump on US officials: 'What a group of losers'

donald trump nice and cool pensacola fl bts_00001523.jpg

Now playing

00:49

Trump's mantra in campaign's final week: Stay on point

donald trump nice to hillary clinton and democrats orig cm_00000000.jpg

Now playing

01:52

Audio of Trump praising the Clintons and Democrats

cuomo lewandowski hillary clinton email exchange newday_00002327.jpg

Now playing

01:28

Cuomo grills Lewandowski on Clinton email 'hypocrisy'

Now playing

00:10

Donald Trump thanks Anthony Wiener at rally

Now playing

01:49

Meet the other Hillary Clinton and Donald Trump