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On the war path. and in a few short hours he can vent in iowa. but to now he's taking it out on twitter. >> reporter: another day, another twitter tirade from donald trump. the gop front run arunner takin at jeb bush, calling him a mess, all because of this defense of his use of the term anchor babies. >> i was talking about the specific case of fraud being committed where there are organized efforts and frankly it's more represented to asian people coming into our country having children in that organized efforts taking advantage of a noble concept with birth right citizenship. >> reporter: t...

Substan substance. >> there are a lot of good talkers running for president and one in particular i'm thinking of. look, talking is good. it's important to be able to communicate. i get that. but i think it's more important to solve problems to you. >> reporter: the latest exchange, a signal of how the battle for the republican nomination is quickly coming down to a war of words between the two top candidates. but bush wasn't trump's only target. last night he bashed president obama's plans to host a state dinner for the president of china saying if he were in the white house -- >> i would not...