And rounding out our agenda, the 911 transcripts are now public. What omar mateen was saying as he carried out the worst mass shooting in american history. And the fbi redacting initially portions of the call where mateen calls himself an islamic soldier. The Justice Department doing a uturn this afternoon, now releasing the unredacted transcript transcripts in just the past few minutes, why they made that initial decision and why the fbi changed its mind. Well bring that to you in just a moment. We begin with our top story. Corey lewandowski is out, fired by donald trump this morning, a Surprise Campaign shakeup that ends a power struggle between Corey Lewandowski and Paul Manafort, one that seems to leave manafort in charge of the Trump Campaign operation. The backdrop for this shakeup, several weeks of declining poll numbers for trump, a host of controversies and selfinflicted wounds by the candidate. The Trump Campaign also marked by unusually public infighting. Check this out. Just moments after lewandowskis firing was learned about this morning, one of trumps top aides, Michael Caputo, tweeted this out. Dingdong, the witch is dead. That from a top trump advisor about, apparently, the firing of Corey Lewandowski. Trying to figure out who in trumps world has his ear, whos on the outs with him. That can be challenging but our nbc reporting today suggests that trumps own family is what ultimately spurred him to action here. You can see some of those close to him here. Sources saying that trumps daughter ivanka trump had been unnerved by lewandowskis performance, that she went directly to her father to advocate for a change. Ivanka trumps husband also known to play a key role in trump strategy, you see him right there next to her, Jared Kushner is a wealthy real estate developer, he owns a small newspaper in new york city, also Donald Trumps sons donald trump, jr. , eric trump, known to play key roles in their fathers campaign. And just moments ago, in fact, katy tur caught up with donald trump, jr. , and katy tur joins us from right outside trump tower here in new york city. Katy, take us through exactly what went down today and, of course, the milliondollar question is what is this going to mean for the Trump CampaignGoing Forward . Is this a signal of a bigger change in direction . Its potentially going to mean that donald trump starts to clean up his act, pivots to the general election like weve been talking about so far. Certainly the party hopes that having Paul Manafort in charge now and two sources confirm to me that he is now the Campaign Manager they believe hes going to be able to better have the ear of the candidate, better prepare him, manage strategy and manage donald trump himself. Ultimately donald trump is going to listen to himself the most. Hes always said hes his best aide, hes his own aide, hes his best advisor. Frankly, part of the problem the party has had is his shoot from the hip style, his going out on the campaign trail or having an interview or Say Something that is counter to the party message. They still, though, do believe that Paul Manafort will be better at trying to manage that than Corey Lewandowski was. Sources tell nbc news that lewandowski became much more of an enabler than an aide, allowing trump to be trump. That worked for them in the primaries but stopped working in the general election. There was a lack of realization or a lack of acceptance from lewandowski that the general election was going to be different the primaries. He was trying to maintain the control he has left and undercutting other staffers in the process. I have been told the family was pushing lewandowski to go for quite some time, confronts their father for months now. The issue was trump was winning during the primaries, he saw no reason, according to these sources, to change the way things are going. No reason to fix something that wasnt broke but with this perfect storm of bad news for this past three weeks, the fact he is down in polls, down seven points, according to the latest monmouth poll. Hes been outspent by Hillary Clinton. He hasnt had any ads on the air and the fact that he is facing a mutiny within the republican party, now was the time donald trump accepted the fact that lewandowski would have to leave. Ultimately, though, some are seeing this as a scapegoating than anything else. Ultimately Donald Trumps in charge of his message more than lewandowski was but there is hope Paul Manafort will be able to manage it in a way that lewandowski was not able, steve. And katy, again, another piece of this is the reporting that its trumps own family that apparently has had his ear on this. Whether its his daughter ivanka, whether its his sons. I understand you caught up with donald trump, jr. , just a few minutes ago. What did you get from him . He was very diplomatic. He said that lewandowski has done a great job in the past 11, 12 months of getting donald trump to this point, getting him the presumptive nomination by letting him be himself, letting trump be trump, but hay acknowledge he made enemies. They acknowledge the relationship between lewandowski and the party was not ideal and though they thanked him for his service and everything he had done to this point and wished him the best, they acknowledged it was time for somebody to come in who has more president ial election experience. Take a listen to how donald trump, jr. , described it to me just a couple minutes ago. He did something that was historic with my father. I mean to take on these 17 governors, senators, have that have all this sitting political experience and to come in as a political neophyte and to win and to win drastically and set records with 14 million voters, thats unheard of. But, again, i think now you walk into a bigger machine going up against the clinton machine which is very big and has the media behind it, has everyone behind it as opposed to americas real message, i think it has to change and we have to evolve. So we had a great relationship and a great split and you probably saw his talk today. We continue to have a great relationship with corey. Publicly the family is praising Corey Lewandowski. Corey lewandowski also praising donald trump. In fact, steve, he will remain a delegate for trump in new hampshire. All right, katy tur outside trump tower, a very busy day in trump world today. Katy, thanks for that. For more on the shakeup were joined by one of trumps big supporters in congress, republican congressman Chris Collins from new york. He was among the first, in fact, might have been the first member of congress to endorse donald trump for president. Congressman, thanks for taking a few minutes. Good to be with you. Let me ask you a bottom line question here. Corey lewandowski, the Campaign Manager who has been there for the rise of donald trump, has been there for donald trump winning the republican nomination, what is the difference going to be for this campaign without Corey Lewandowski there . Well, i think we all know that paul manna ford has a lot of experience and as we move forward ill use the word discipline. We have the winning message making America Great again for all americans, securing our borders, getting our jobs back and putting america first, thats the message that wins this election and it takes discipline to always go back to that message and remind americans what it would be like if Hillary Clinton were to be elected and we had effectively a third term of barack obama with stagnant wagewages. Were the worlds superpower, we dont act like it, we own 25 of the worlds economy, we dont act like it. So its the message donald has that will win the election but it does take discipline and i think Paul Manafort will bring that forward from this day forward that as mr. Trump will be mr. Trump but were going to continue to remind americans of what the Supreme Court and what america would look like were Hillary Clinton to win and that contrast is what we have to stay focused on. Donald is a winner, his family wants him to win, he want him to win so i think this was a natural transition from a primary to a general. There are two different worlds. Youre using that word discipline there. Message discipline we talk about in politics, in the Campaign World how important thats considered. When you look at paul manna faf emerging as the lead strategist here. What is that Paul Manafort can say to donald trump that will advance the interests of discipline that youre talking about here . Well, i mean it comes back i was a novice to politics as well and i was in a very, very difficult primary and ironically we were talking about mr. Caputo. He ran the campaign for my opponent. Were now very good friends, thats what politics does. But when i had to run a general election against a popular incumbent we had to have that message discipline and as i would go on stage and as i would go into an interview, someone would be next to mery minding me in many cases remember, this is the message, remember, stay disciplined and sometimes thats all you need. Someone standing at your side as youre about to go on an interview, go on a stage just to remind you of the importance of staying on message. And thats how disciplined Paul Manafort is and i think its a good move. Those of us in congress are just looking forward. Were not looking backwards. We thank Corey Lewandowski for winning and running the most Impossible Campaign ever to lock down that primary on may 3 when ted cruz withdrew on may 4. So were looking forward. We have a lot of elections. Every member of the house is up for election. We have the senate in play. So we view this as a good pivot to the general election to take the fight and stay on message to remind people that we dont need a third term of barack obama. America has to return to being and putting america first. And when you talk about that pivot, though, the idea of having different leadership for the primary campaign and for the general election campaign, switching to the general election right now, is it fair to say from the Trump Campaign standpoint that what works strategically and what works stylistically in the republican primaries is not right now working from a general election standpoint . The message hasnt changed. Thats the irony here. Where Hillary Clinton uses focus groups to change her message everyday, Donald Trumps message has never varied. Put america first, make America Great again for all americans, secure our borders, get our jobs back and defeat isis. Thats been donalds message from day one. But the voters are different in the primary. He had 17 opponents. The voters are we need democrats and independents coming on board. We need to remind them of donalds message so its 50 states and much bigger stage so its not that donalds message changes, in fact, it doesnt change at all. But the voters change. Primary Republican Voters are different than a general election. So, again, the discipline is important and as we remind americans of what a presidency with donald trump and what our future looks like for our children and grandchildren, hes going to win the election but it does take that level of discipline and i think well see that moving forward with Paul Manafort standing at his side. Congressman Chris Collins of new york, thanks for the time, appreciate it. Good to be with you, steve. We are going to have much more on this shakeup and a lastminute effort as well by some republicans who insists there still time to deny trump the partys nomination. Why theyre saying thats a possibility. That is ahead this hour. Now we are going to turn the shooting in orlando, the continuing aftermath from that. Chilling details today of the gunmans call to 911 during the nightclub attack. The fbi just releasing that transcript and their timeline of what happened inside. Nbc news justice correspondent Pete Williams has the details. Theres a controversy today because of what the fbi originally did not include knees n these transcripts and apparently now in the last few minutes has decided to include. Whats going on here . Well, the news is the timeline here. This is a full accounting or a better accounting, a remarkable amount of detail, really, at this point in an investigation about the interaction between police and omar mateen. They said he initially made this 911 phone call and when the operator twice asked him what his name was he said my name is i pledge allegiance to Abu Bakr Al Baghdadi of the islamic state. We learn there were three calls with Police Negotiators for a total of 28 minutes and during these calls he said that he had an explosive vest like the one they have in explosives in his van and the this timeline also discloses that people inside told the police they heard him say he would put explosive vests on four people inside the nightclub. Now none of those claims turned out to be true. They never found explosives in the nightclub. We learned at one point police pulled an air conditioner out of the wall, air conditioning unit and that allowed additional people to escape and then hes finally shot when he emerges from one of the holes they punched in the wall with the explosive explosives and that bear cat device. So the total of the timeline goes from about 2 00 when the shots rang out until the end when he is killed and according to the timeline and what the police have said, no one was shot after the initial exchange with Police Gunfire in which he was forced into the bathroom. There were no further shootings until he came out and the police shot him. All right, learning all sorts of new details here. Pete williams walking us through it in washington. Appreciate that, pete. Also on the agenda in politics today, the senate is going to vote in the next few hours on four gun control proposals. Is it a break through for gun control opponents or is it political theater . Well walk you tlul exahrough e what the senate is about to pass and if it has a chance of passing. Later, extreme heat. Nearly 30 Million People suffering through oppressive temperatures as the first day of summer arrives. Well have the latest on what is now a deadly heat wave and how fire conditions are getting worse because of it. As youll , when shoppers add an item to their jet carts, they automatically shrink the prices of millions ofther products. Very impressive. Whoo, its got a lite kick to it. Sorry, iant hear you . . Nice shirt craig. At jet. Com, we always find innovative ways to save. Get 15 percent off your first order. Booking. Com offers free cancellations, so youre free to decide if the trip youre on. Hahahahahaha . Isnt reallthe trip you want to be on. Hahahaha. Hahaha. [mountain woman and key laughing together] what if 30,000 people download the new app . Were good. Okay. What if a miion peop download the new app . Were good. Ve milli . Good. We scale on demand. Hybrid infrastructure, bm. Ok. What if 30 Million People download the app . Were not good. Were total heroes. Scale on demand with the Number One Company in cloud infrastructure. 80 try to eat healthy, yet up to 90 fall short in getting key nutrients from food alone. Lets do more. Add one a day mens gummies. Complete with key Nutrients Plus b vitamins to help convert food into fuel. One a day. Some breaking news. Youre looking at former president bill clinton. Thats his daughter chelsea, thats her husband. Chelsea clinton, of course, giving birth to the clinton bill and Hillary Clintons second grandchild over the weekend. Aiden, theyre just loving the hospital. You can see bill clinton and Hillary Clinton behind them. Thats chelsea clinton, her husband mark, they are getting into a vehicle there with their newborn son aiden. A scene playing out right now. I wanted to show you some live pictures of that. You see Hillary Clinton in the shot, keep an eye on this for a second. Of course we say this is the second grandchild for bill clinton and Hillary Clinton. Houma abedin, clintons top aide, she just walked by in the shot, a lot of clinton there you can see Hillary Clinton waving to the camera there, bill clinton as well. Just a couple years ago their granddaughter charlotte was born to chelsea and mark. Now a grandson, aiden. Just a couple days ago born. Hillary hillary ofly this has been a triumphant month for the clinton family. Aid. She came so close eight years ago to getting the nomination. Now shes wrapped it up. And for the second time becoming a grandmother. They were thanking the doctors right there. So that is the scene. Chelsea clinton leaving the hospital in new york city with her new son, her mother and father right there in tow. Thats the scene. And as we move away from that, we are going to move to the showdown playing out in washington, d. C. This afternoon. Votes expected in the next couple hours on gun control. This the result o