,,,,,,,,,,,,,,,,,,,, breaking news nit. clash of the titans. mittneyunlehingng a b bsteringttacac o i dono ump, calling him a phony, a fraud, warninrepublicans to stop him trump fifes back and the gop p braces for all-out war. caught oncacara, a school police officer smacking and kickg a-year-old, a imin stion. surprise noununmeme from soccer susurstar brandidichasin afr her icicic victory celebration. why sheaiddshe's :donating h brain to science.e.e. e price you pay for health carea nene patientsre ney, o o o avage $100. we'lowou. d ststy ti. dodog the reading and d mey good. lilienerlovingry

right nono >nnouou: frfrfrbc ws world headarrsn new york, , thisiss "nbc nigly news" with leleer holt. good evening..$& i i ike nothing we've seen before in morn americanan polical history. mitt romney, the publican's last predentia nominee, delivering a stinging int-by-pointnt takewn of s rty's s rrent front-runner, , donald trump e stoto trump moveme reaing a a 9new level o urgcy with romneyn a eech at a time that sodeddike an intervenenononlaling ump a phony, iscerang polies as ckscsc it's'slee're witising open warfare tonight over the future off the republican pay. have two repts p stting wh h c' peter alexananr. >> repter: in 20 minute mitt romney branded his

dangngouand d mb. >> hehe's s at i inow. donald trump is a phphy, a frauau his prisesesre as s s worthlesesas a degrgr frorotrump university. >> rorter: republican party vilifi the man to succeehim. >> you say, wait, wawa, wawa. in't he a huge e business success? doesn'he knowhat he's talkg g out? , he i't. and d@, he doeoe. his baruptcies have crususd small businesses. and the men d won who work for them. he inherited his business, he didn't create it. and atever happened tortmp airlines and th there's tmp gane d trump dka, a ump steaks,`and trump ppmortgage a business giuhe isot.. >> reporte reat blastin the billionaire fo lacking the temperament to be 0president. t tnk of donald trump's person qualities. ththbullying, the gree the

misogygy, the absurd thirdde theatrics. >> reporter: accusing trumpp@ manipuputing the ic anger. >>createte p scegoats of f muslsls and m m can immigrants. gerno romney trying to m me t lastitch effort for thelishment day.y. he knew i i it wasn'n' gog to happentoday, itbably s never ing to h >> reporter: f fr years ago, romney welmed trump's endorsement. today tweeting trump wouldn't veveccepted . ififot t tmp, then with who? >> vote for marco o o rubio in florida anhn kasich in ohio and foted cruz >> rorr:r:ld romney jp in? `we tri tget his attentio bubunonjesponse.e. ifift'trump, this di prediction. a pso twthasas lly totctustnoco prt. ofsemp nanaonbleser ory. >> ^eporter: peter 0 alalander, n new

>> will he talk about our policy ffces? ororl attack me with every imagagable low rd donald t t t delivered. >> i il just aress itituickly cae it irirle. i could have t, mitt, dp to y yr knkns, he would he dropped t t h knees. was bgigi. frt-runner i back at the name callin today. >> he's a ok artist. >>eporter: a ntenabt romney eoed trump uuppororrs he's a loser. reporter: t rmer nom now dang t potential l ne to be transparent. >> all he has to do is release his back taxes likhe promosed he would. >eporter: a dand d ump ignored. the g front-r-rner taking f ofoftage, isisbout t tce it t onstste. tonighs toughehe rematch ye head-to-head with megyn kellll for the fifit me in eight mont. e ioioire trashing kel r she asked him about s n wos s sulting men. >> you call women you don't ke t pigsdogs, ,ls,s,

your -- >> onlnlrosi o'doell. repepter: tonht sureo get heated witi noen carson, usfour podiums ft.. >>hat is your plan? >> reporter: aideseso o ma rubio promisinthe senatowiwi expose t bilhelionaire fohis s scomings, and g ll gealhe nedto trp no t atioio home state. spending $1 million on florida tv. the cruz campapan down lele than 100 degates, s the xan won't geinhe d.peitherwa trumpays he's readydy >> they said act pridential toght. i sa, somomody p tse, i'm g to h them ck harder. >> reporor jn kach'sam said ty'll t to stayututf the fr tonht. bukemist p thst to ay ad t byh,h, ky tu u. wtoringn potidireor th to "eth& " chucto jhahaed he dt'e me, uc >>an t, otan

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before ress lking to i. spti an ise do trumisedin y. :ine'e' arre fothe- siation. >>oregeg issu wi cla formation shdl. whasame? atas h rol oidg gal e whasasone er direio anwhatas ledg >> r rte thebi reor s n ar >>m m onalo thates. repor t ins okn id s geto b* ininrviewed the fb >>al secretaty clintoin answer s y he fifistepelpipi tem wraupheestiga. 9 there is no assi teals. >>r: cocoroy ha nowhahawed cln foa ll . li, w a c someg? >> d ds itai mentestion >>hink so. >>orter: bnie saerse h h ss osust ll and y s wife adviser

inte n.buwe'rnoiniftoke a a ist tf it. >> r r rrjis & clto havavto testif r team says p aidi is n atingl t y&tur at tppice part( decisln i#sutxhe rpup9niui ai >> andrehaou. --->therereren lolotsight vo t p o debris off easte riri, posbly belongingo the missininalsi airlineslighgh370. malaysiaauauorititititerered day y at icic suggests it t kelylycaca f f fa a boeieiei77 we're heheheg g rere frfrhehe amererererer fouou i i hererebcbc tomom ello >epororr: t t otototphs s s s the possible debris found off mozambique raised rarara ququon isre n nririri lililiik sawawn the first ece o debris that waed ashore last er, c cered barnaclelen nearby reununn island?

ve been wasasd clean it was stuck in the sand. t the wos "no stepe still sugges a vient pact with the ter, but they'dxpect to see a relatively flimsy horizontal fit. >> i can't assume at all it has to do withh-370. >> reporter:r: piece mozambique by blaine algibson. >> this could possibly be from malaysia 3. we don't k kw yeye reporter: gson has blogged about mh-370, even treled acacss asia meeting victims' families today he said his interest#drew him tohe beach. wanted to go to a place where debris washes asho from the open indian ocean. my heart was t tmping. there was anticipathe waexcitement. >>epter: while the primary search zone is still thousands of miles ay, marine expes en't surprised debris h turned up onhe other side of the ocean. >> t ocean is ch more

colicated than a straight flowing river. you get swirls, you get big waves. >> reporter: even if investigators conclude the debris is from mh-370, it won't tell them where the rest of the plane is. the search rains focused some 3,500 miles t`e east. lester? >> tom, thank you. a rprise announcement today from american ccer hero brdi chastain. so many rember her iconic world cup victory celebration. now retired, she said after years of taking hard - hits, she ll donate her brain to science, raising awareness abouthe threat of concussions to women and girls. that it's not just a guys playing football. nbc's erica hias more. >> reporter: the woman behind one of the most iconic moments in sports history is hoping to leave a more lasting legacy. pledging todayo donate her brain for researar. chastain spoke to nbc news about head injuries last november.

things like ct traumatic bra injury. these are real these are long-lasting. and what we can't do is we can't study the brain while somebody's alive. >> reporter: her brain will go to researchers at boston university, studyi chronic traumatic encephopathy, or cte, and a psible link to concussions. the lab has 307 brains. only 7 are from women. >> we really don't know aut cte in girls'ports, women's sports. we need mor specimens. we need mor ways to diagnose it. >> reporter: chastain, who retired froccer in 2010, estimatethere were probably half a dozen tim she shook off possible conssions from heinthe ball. girls' soccer has the second highest number of concussions among high schl athletes. with female players suffering 40% more than their male counterparts. now a mom and coach, chastain worked with

to changehe rule for heading inth league. >> as a coach and advocate and soccer ambasdor, i haveo do what's right for the safety of the players. >> rorter: continuing her commitment to the game, and itfuture. erica hill, nbc news new york. a criminal investigation has been launched over a troubling scene caught on tape in baltimore. it shows a school police officer slapping a young man in t face multiple times, and then kicking him. it's just e test incident raising questions about the use of force among baltimore law enforcement. nbc's ron moas the story. >>eporte tonight an vestigion under way in baltimore over this four-second cell phone video, showing a scho police officer slapping and kicking a 16-year-old boy while a second officer looked on. >>s a parent of a baimore city school student, i was appall by what i saw. >> reporr: the mayor, whose city is closely

series of criminal trialsf police offics in the death of freddie gray, found it experated by another poli-invold controversy. ofcialsay e two ficers were responding to a report of school intruders. but a lawyer put the 10th grader and his family told nbc news he is enrd a student there. the chd and family want to keep their names private. he's minor child. mily is traumatized by what happened. baltimore city school police office was seen on camera hitting a female the officer ter pleaded guilty the city sool's police chief sae's so troubled by what he saw. >> according to our use of fo definitely excessive forcwas used. >> reporter: in a statement, the state's&attorney's p office said it takes this matter very seriously and is workg closely wi the city's police dertment and school police to inveigate. tose rces opete separately. law enforcement in babaimor

ron mott, nbc news. ill ahead tonight, slashing dtor bibis by thousands of dollars. the ite making scounton medical services as ea as ` oking the cheapest flig online. also, story time. kids testsng outheir reading

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finally tonight, a story & aboulethe power of reading that combines two kinds of tails,he tales we f nd in boo d the tails our furry friends wag with deght. c's jofryer ininoduces us young readers with an - audien at's eager to sit and stay for the ne chaptern tonight's "making a a fference."." >> reporter: when you're a shelter dog, you reafly are your own salesman. for a timid p like biscuit, that'sot always the easit job. >> most dogs in a shelter seing are sced and frigened and anxiety-ridden, and they show signof stress. >> reporter: whi is why the humane society of missouri is pulling out every trk in the bo. at this . lolos s

nteer theime reading to ts that t e waiting for a good home. they call it thehe shter bubus reading program, an idea that started around christmas and d quickly took off. >> i personay lo anal eye myor thgs thrl >> reporr: the chdrenenre actuly trained to seek o anxious do by p reing thr bodyanguage. it's amazing toee the reactiononf these dogs in almost evy situation, they come from the back to the front to gre the kids. >> reporter: the more these dogs learn to engage with ople, the better their chances of adoption. >> think they real enjoy it, because they're tting to teract with people. >> reporter: a the kds get something out of it, too. theye learning pathy. a win-win situation ankso an unconventional partnership. even biscuit is looking a lot more condent. e of many precious pups ready to cse theale d make a

connection. joe fryer, nbc news. >> we want to tell you that bisiuit i i stiti p t t thelterndhppp fodoptptn a a thehe humane society of & - missouriri but i have a funny eling t for long > atat going to do or us on a ahursday nighgh i'leerolt. swswpipoeblic land witthe broadmoor.. the oposed deal ge new susut t y-ut we' a en froroopopopopopop ntstt intsrackck liana bi tthe e eel ty. we're learningngonighththow w w dozens of layoffs@at thehel ulimcthe c cmumu as a whe. hello o eryone and thas for joining us for news 5 at 6. m lisa lyden. and i'm rob quirk,... first tonight-we're followg up on a news five e vestigation. e's a new push at the ste

students to take medical jua whilelat school.l. as we' rorted.. nonoolorado districts have created medicacamarijuana policies.. even though ack's law" passed st year.. our kelsey kennedys looking into what lawmakers are considering now.. kelsey? the representatiti that wre jack's law.. told me tohe's diappoint that dididictctstilaren'towi student need medalalbcannbbis to ta iatchool.l. e'consing nenenegislthatatouldldake diststststimement t t dical maana polili.... "t idea is,s,tead of opening g e doors to och, d dayiyi y y c c do th n, we'ring d ay you have e & dodo this. you haha to ke r rsoble acacmodadaons s r kidsith f serious s dical issues." presentati sininr's "jack's ll partw wou h ududtstsise jbsoors.. .. s elief om s sererseuyes.v.& ckn hasn ree sch@ much at all this aj.. ouan deny a child their education if they need the medicineyou can deny the chi dicacaca if ey n na&