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and so he got upset and so he said he'd take one and he'd challenge me to one and he'd beat me. maybe he would, maybe he wouldn't. but what i said is, okay, well, if that's the case, then get on a debate stage and let's go. bring it, donald. show me what you got. >> nikki haley going after donald trump at the very start of her speech in her home state of south carolina. a real shift from previous rallies. we'll have more from the campaign trail and the new polling from the gop front-runner. plus we'll bring you the latest from capitol hill where there are now serious doubts about the...

american troops? >> the strikes that we have taken in the past have definitely had an impact on degrading and disrupting the activities of some of these groups. clearly they have decided to keep conducting those attacks and now it's had lethal consequences for american troops and so we will weigh an additional set of options before us, the president will make his decision to respond appropriately. the attacks need to stop. >> does the president have all the legal authority he believes he needs to respond to these attacks? >> yes. >> what is the legal basis? >> constitution, commander...

definitely had an impact on degrading and disrupting the activities of some of these groups. clearly they have decided to keep conducting those attacks. and now it's had lethal consequences for american troops. we will weigh a set of options. the president will respond appropriately. the attacks need to stop. >> what is the legal basis? >> the constitution, commander in chief, the self-defense of our troops. the president has authority that take the action he needs to protect our troops and facilities overseas under article 2. >> the president faces a great deal of political pressure...

>> dana: a growing national security risk along the southern border getting worse by the day as an alarming number of foreign nationals enter the country, make a run for it and then get away. we have no idea who they are, where they are going, what they are doing, or even why they're here. welcome to a new hour of "america's newsroom," i'm dana perino. that was a lot of questions. >> bill: yes, we'll try to answer as many as we can. good morning to you. the morning after here we're in new hampshire. big primary night last night. we get to all that analysis. i'm bill hemmer. sources t...

drops out of the race, saying it's clear a majority of republicans want to give trump another chance. the bombshell announcement comes as trump and nikki haley sharpen their attacks on each other. haley now claims the former president is experiencing cognitive decline after appearing to confuse haley with former house speaker nancy pelosi. rachel scott is in new hampshire with what this means just two days before the new hampshire primary. >> linsey: also tonight, american troops targeted. attacks on u.s. air base in iraq now raise concerns about a wider conflict. this all comes just...