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>> the fight for number two is the hottest ticket in the republican primary race. wolf, make no mistake about it. donald trump is also trying to influence this fight for number two. the questions he raised about ted cruz' citizen ship are still dogging senator cruz in iowa and that's where donald trump is heading tomorrow for a weekend of campaigning after he finishes up tonight here in north carolina. >> jeff, thank you. jeff zeleny. let's get some more now on this. joining us our chief political analyst gloria boring er and mau ragu. fox news put out polls. trump doing amazing still amazing ...

So who is the biggest threat to the hillary clinton campaign? with us now fox news chief white house correspondent ed henry. so, ed, who is team clinton most worried about? >> well, in private, what they say is some combination of john kasich and marco rubio. you mention them at the end there in terms of the new hampshire poll. they are seen as more moderate within the party, especially compared to someone like ted cruz. they have neither have been at the top of the heap, neither rubio or kasich. rubio doing better than kasich nationally in most polls. the fear in the clinton camp at least wha...