Rubio Escalates Attacks on Trump Amid Surprise Endorsements

ABC's Jon Karl reports on the latest in the GOP infighting over front-runner Donald Trump.
3:02 | 02/28/16

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Transcript for Rubio Escalates Attacks on Trump Amid Surprise Endorsements
Tomorrow, this campaign goes national. Hopefully, we'll win About starting a university that's a fake university. Reporter: Throughout the campaign, Rubio insisted he wouldn't go after his fellow republicans. craving in the media for people attack me on Twitter for wearing Little mouth on him. When the heat was on senator Rubio, you saw what happened. aggressive strategy too little So much at stake, senator Lindsey graham had a colorful republican party. Lindsey graham, bat bleep crazy?

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

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