Rudy Giuliani reacts to Dallas ambush shooting
Now Playing: Sen. Joni Ernst on Protecting American Freedoms
Now Playing: Republican National Convention Day One In A Minute
Now Playing: The First Night of the Republican National Convention Closes
Now Playing: Retired Lt. Gen. of U.S. Army: "Wake Up America"
Now Playing: RNC Highlights From Night 1: Melania Trump Sets the Tone
Now Playing: Donald Trump"s Flashy Convention Entrance
Now Playing: David Clarke Criticizes Black Lives Matter
Now Playing: Melania Trump: "Donald Wants Prosperity for All Americans"
Now Playing: Darryl Glenn Speaks at the Republican National Convention
Now Playing: Family of People Killed by Undocumented Immigrants Speak Out at RNC
Now Playing: Melania Trump: My Husband Will Represent All People
Now Playing: Rep. Joe Crowley Looks Ahead to the Democratic National Convention
Now Playing: Rudy Giuliani Denounces "Islamic Extremist Terrorism"
Now Playing: Sen. Jeff Sessions: Trump Will Be a Strong Leader
Now Playing: Actor Antonio Sabato Jr. on Why He"s Behind Trump
Now Playing: Sen. Tom Cotton: "Help Is on the Way"
Now Playing: "The Real World" Couple Excited About Republican American Dream
Now Playing: Jamiel Shaw Raises Awareness on Broken Immigration System After Son"s Death
Now Playing: Battle of Benghazi Veterans Tell Their Story
Now Playing: Antonio Sabato Jr.: "Our Country Needs Donald Trump"
Source: http://abcnews.go.com/Politics/video/rudy-giuliani-denounces-islamic-extremist-terrorism-40686829
