'This Week' Transcript: Gov. Chris Christie

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ANNOUNCER: Starting right now on ABC's THIS WEEK...

UNIDENTIFIED SUPPORTERS: Hillary! Hillary!

ANNOUNCER: Hillary's relaunch.

HILLARY CLINTON (D-NY), PRESIDENTIAL CANDIDATE: Thank you.

Thank you.

ANNOUNCER: Revealing a new strategy and the personal story she says is behind her run.

But will it be enough this time?

We're with Hillary 2.0, campaigning this morning in Iowa.

Christie's comeback -- down in the polls, can his big new push on the trail help him break through?

Our exclusive interview with Chris Christie.

Plus, inside ISIS world -- the stunning new video of ISIS on the rampage, terrifying Iraqis far from the battle zone.

And the White House's major new move against the terror group.

Are American boots going to the front lines?

From ABC News, THIS WEEK WITH GEORGE STEPHANOPOULOS begins now.

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GEORGE STEPHANOPOULOS, HOST: Good morning.

Welcome to a big week in politics. Hillary Clinton's relaunch rally Saturday. Jeb Bush makes it official tomorrow. Even Donald Trump is set for an announcement Tuesday and Chris Christie is standing by live right now for our exclusive interview.

First, here's ABC's Cecilia Vega on the trail with Hillary in Iowa -- good morning, Cecilia.

CECILIA VEGA, ABC CORRESPONDENT: Hi, George.

Good morning to you.

Boy, if this campaign didn't feel official before, it certainly does now. Hillary Clinton landing here in Iowa just hours after giving her first major stump speech of this campaign.

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VEGA (voice-over): Hillary Clinton kicking off her presidential campaign once again. The first rally of her 2016 White House bid, a chance for the former first lady turned secretary of State turned two time presidential contender to reintroduce herself.

CLINTON: I think you know by now that I've been called many things by many people. Winner is not one of them.

VEGA: Husband Bill and daughter Chelsea joining her center stage as Clinton got political...

CLINTON: We can't stand by while inequality increases, wages stagnate and the promise of America dims.

VEGA: -- personal...

CLINTON: My mother taught me that everybody needs a chance and a champion. By 14, she was out on her own working as a house maid.

VEGA: -- and went hard on policy.

CLINTON: We should offer hardworking, law-abiding immigrant families a path to citizenship.

VEGA: Clinton saying she has made mistakes, but not directly addressing those controversies hanging over her campaign, like those e-mails. A recent poll showing a majority of Americans, 52 percent, do not see Hillary Clinton as honest and trustworthy.

Democratic challengers are stepping up the fight. Vermont Senator Bernie Sanders on Saturday in Iowa, calling out Clinton for still not taking sides in key fights, like the trade deal that Democrats in Congress just helped defeat.

SEN. BERNIE SANDERS (I-VT), PRESIDENTIAL CANDIDATE: I don't understand how you don't have a position.

VEGA: Overnight, Clinton landing in the Hawkeye State, too, testing out her new stump speech on the road.

CLINTON: I want to work with you to build an economy that works for everyone.

VEGA: And Clinton headlines to a number of other swing states after Iowa. She is really trying to cement this image of herself as a fighter for the middle class.