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the world. a i'm john avlon in for kasie hunt. four weeks from today, we'll be waking up to results from the iowa caucus, so this is crunch time in the land of cornfields and presidential politics. donald trump holding a rally there tonight while nikki haley is going on offense. >> i've done well over 120 something, 140 town halls. and i never talk about my opponents. but today i am. >> the former u.n. ambassador and south carolina governor is sharpening attacks against her opponents calling out donald trump last night for his persistent praise of dictators. also the haley campaign a...

Conversations on the jury. when you are making these assessments, you rely on stereo types. you are making snap judgments around strangers. which is why this is such an important process. >> thank you so much, yasmin vossoughian, and charles coleman, and catherine christian, appreciate all of you. please stay close. still ahead, things got ugly on the house floor this afternoon. what caused one lawmaker to get in speaker mike johnson's face and threaten him. plus, more than a dozen members of the kennedy family have formally endorsed president biden. what it means for one of their own, rfk j...

Knocking down barriers, running and hiding for their lives. >> there's like a stampede of people running. me and andrew hopped the counter to hide in the back of chick-fil-a. >> reporter: tsa officers ushering people to safety. >> so, everyone just takes flight and everyone's jumping over each other. i'm trying like to grab parents, grab kids, trying to tell people to just go, go, go. >> reporter: police say when they detained the suspect he reached into his pocket, causing the panic. >> he has a grenade or something in his hand! >> reporter: police say the suspect was unarmed, but taken into ...