Scott Walker Drops Out of 2016 Presidential Race

ABC News' Tom Llamas and Matt Dowd track the latest news from the 2016 presidential campaign trail.
4:17 | 09/22/15

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Transcript for Scott Walker Drops Out of 2016 Presidential Race
He lands at Andrews air force base. "Your voice, your vote" and a big shake-up. Wisconsin governor Scott walker drops out and calls on republicans to stop Donald Trump as Ben Carson defies calls to drop out for his comments about muslims and ABC's Tom llamas is on the campaign trail with him in sharonville, Ohio. Reporter: The walker campaign lasting just 71 day, one of the shortest in recent memories, I was actually speaking with Donald Trump over the phone when walker was dropping out and he couldn't believe it like many others and couldn't believe it happened this early but this morning Donald Trump is taking the high road, not attacking walker even though walker says trump needs to be beat. This morning, a one-time front-runner dropping out of the gop race for president. I will suspend my campaign immediately. Reporter: Sources say a campaign cash crunch forced Wisconsin governor Scott walker to call it quits, walker slamming current republican front-runner Donald Trump on his way out. I encourage other republican presidential candidates to consider doing the same so that the voters can focus on a limited number of candidates who can offer a positive, conservative alternative to the current front-runner. I spoke with trump about the narrowing field while walker was resigning. Well, I'm surprised but I think he did the right thing and I think you have others that should drop out. Because if you look at some of the Numbers where there are zero or 1%. Reporter: Some calling for Ben Carson to drop out after he said this. I would not advocate we put a Muslim in charge of this nation. I absolutely would not agree with that. Reporter: But overnight changing his tune saying he meant radical islamist, not moderate muslims. I don't care what religion or faith someone belongs to, if they're willing to subjugate that the American way and to our constitution, then I have no problem with it. Reporter: Carly fiorina now in second place according to the latest national poll coming out strong on this topic late last night. Well, I have think that's wrong, whether it's a person of Christian faith or jewish faith or Muslim faith or other faith, I think faith gives us humility and I think that's important. Reporter: Dr. Ben Carson says his comments were not that controversial inspire political change. He's after something else, they say, he's breaching the gospel, robin. All riterry, thank you. The popegton thisfter anoonor his three-city whirlwind U.S. Tour which also includes New York and Philadelphia. While here, Francis, pope Francis will say four mass and make a total of 24 public appearances including at the national mall, central park and Independence hall. ABC's Reagan Cecilia is in Washington this morning where they have rolled out the red carpet. Good morning, Cecilia. Reporter: Good morning, robin. Not only is that red carpet out there are a lot of barricades all over the city too. This is going to be a historic visit filled with pomp and circumstance but the very first thing pope Francis will see when he arrives later today at Andrews air force base is the president and the first family, and two and now number five. Who is helped most by this? You can see who the vultures picking over the dead carcass of Scott walker who is taking contributors -- Jeb bush, Ted Cruz and keep an eye on kasich, he is the last midwesterner in the race, the midwestern states are winner take all when we get towards the end of the primary and he could make a play in Iowa. Carly fiorina had a light moment on "The tonight show." ? My name is snick and I'm lazy please don't take a walk with me I'd rather stay right here instead I want to lie back down in my nice warm bed ? ? my name is sick and you're going to have to carry me ? Different side of her and we have two rays in the republican party. You have to watch these kind of things. You want to be human but you don't want to look like you're embarrassing yourself. Outsiders versus insiders, fiorina, trump and the insiders who battle over that and it will be an outside/inside race. Now to a mystery in the sky.

This transcript has been automatically generated and may not be 100% accurate.

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