southwest. this he'll cast their ballots. could make hillary clinton and donald trump unstoppable. also have a brand-new poll out moments ago it shows trump with his biggest lead yet at nearly 50% across the country. abc's tom llamas has all the latest. good morning. >> reporter: good morning to you as we just saw polls show donald trump may have a big night tomorrow but now he's dealing and the other candidates are all seizing on it. >> wow. >> wow, this is amazing. >> reporter: overnight, donald trump speaking to a massive crowd in alabama, a super tuesday state, but not mentioning a syllable about the controversy involving the ku klux klan and their former grand wizard david duke. >> would you say you condemn them and group. i mean i don't know what group you're talking about. >> i'm just talking about david duke and the ku klux klan here. >> i don't know -- i don't know david duke. i don't believe i've ever met him i'm pretty sure i never met him. i don't know anything about him. >> unloading on him by his rivals. claiming he missed the chance to condemn a hate group. >> we ca

>>> a rock star reception for donald trump. >> wow, wow, this is amazing. >> commanding a massive crowd in alabama. facing fire from all sides after failing to condemn the kkk. >> not only is that wrong, it makes him unelectable. >> but can anything stop the front-runner's surge on the campaign's biggest day yet? and is hillary clinton on the verge of locking down the nomination? >>> and we are taking you behind the scenes of hollywood's biggest night like only "gma" can from the red carpet to backstage. you won an oscar, brie. you won an oscar. >> i really can't believe it. >> we're one-on-one exclusively with the big winners. their first interview, seconds after taking home the gold. all the unforgettable moments. >> let's get this money. >> the "gma" oscars after-party starts right now. >> good morning. >> america. go crazy crazy cake by the ocean [ cheers and applause ] >>> can we take you home with us? we love to walk out every morning with you here with us. >> good morning. >> good morning, america. good morning from hollywood. [ cheers and applause ] >> we have a very speci

that brought everyone to their feet. reception for donald trump. >> wow, wow, this is amazing. >> commanding a massive crowd in failing to condemn the kkk. >> not only is that wrong, it makes him unelectable. >> but can anything stop the surge on the campaign's biggest day yet? and is hillary clinton on the verge of locking down the nomination? >>> and we are taking scenes of hollywood's biggest night like only "gma" can from the red carpet to on an oscar, brie. you won an oscar. >> i really can't believe it. >> we're one-on-one exclusively with the big winners. their first after taking home the gold. all the unforgettable moments. >> let's get this money.ars after-party starts right now. >> good morning. >> good morning. go crazy crazy [ cheers and applause ] >>> can we take you home with us? we love to walk out eith you here with us. >> good morning, america. good morning from hollywood. [ cheers and applause ] >> we have a very special show coming up this morning. from the legendary el capitan theater here in l.a. and just like the oscars, we as you can see we have a live,

he stop her? >> thank you, david. >>> meanwhile, on the republican side of this race, donald trump out on the trail and opening fire on his new nemesis, marco rubio. trump is getting help now from his new ally, chris christie. but rubio who had been keeping it positive, until recently, is not relenting. mary bruce is in memphis, tennessee, this morning. mary, good morning to you. >> reporter: hi, dan, good morning. with super tuesday around the corner, the attacks are getting supersized. it is getting ugly out here. the republican candidates seem to be using every chance they get to take each other down. >> he's a very nasty guy. >> friends don't let friends vote for con artists. >> this is my country, damn it! my country! >> reporter: this morning, the top republican candidates are eviscerating each other. unleashing some of the nastiest attacks yet. as they head into super tuesday. >> but he's flying around on hair force one. >> reporter: marco rubio trying to out-trump trump has launched a personal assault against the front-runner. >> he just came out firing. >> reporter: rubio'

. chris christie joining forces with donald trump. >> now, this alliance raising all kinds of questions. will it give trump unstoppable momentum heading into super tuesday, and what does it mean for a supposedly surging marco rubio? we start our coverage this morning with abc's mary bruce right in washington. hi, mary. >> reporter: hi, paula. good morning. well, this is a potential game changer in this roller coaster campaign. donald trump getting his first major endorsement from a card republican establishment just as he heads into super tuesday. his former rival showed up unannounced and dropped a bombshell on donald trump's campaign. >> we need a first class president, and we're going to have it in donald trump. >> reporter: new jersey governor chris christie this morning is lending his credibility to trump's runaway campaign. >> i can guarantee you that the one person that hillary and bill clinton do not want to see on that stage come next september is donald trump. >> reporter: they weren't always so friendly. >> we're going to do it. i'm going to get it done because i ma

endorsement, a former foe signing on. >> there is no better fighter than donald trump. >> now double-teaming marco rubio. >> he was putting on makeup with a trowel. >> rubio, meanwhile, taking his own swipes. >> he was having a meltdown. >> the latest twists and turns and the predictions for today's democratic primary in south carolina as we head into a crucial super tuesday. >>> zika alert. the cdc's startling report. the american pregnant women who visited countries with zika outbreaks. what happened? plus, the new travel advice from health officials. our dr. besser tells you what you need to know. >>> opening up, the superstar jennifer garner talking for the first time about her breakup with ben affleck. her really candid comments about her ex. did ben's alleged affair with the nanny truly end their marriage? >>> and countdown to the oscars. your backstage pass to the glitz, glamour and huge surprises. >> right now the red carpet is covered in plastic, but that will soon change. >> the big reveals from the producers, presenters going animated, excitement bubbling over as hollywood gears u