Traffic stop. Accidental stowaway. Passengers hear frantic knocking and screaming from the cargo hold while their plane is in midair. Were going to have to circle back around. So what was a baggage worker doing in the cargo hold . Im wolf blitzer. Youre in the situation room. Iraqs Largest Oil Refinery under siege. Bitter fighting as Government Forces try to keep the terror group from overrunning the crucial oil facility. All this comes as iraqs Prime Minister has been meeting with president obama today over at the white house looking for even more u. S. Military and economic assistance. And as congress is muscling its way into the Iran Nuclear DealSenate Republicans and democrats agree they want oversight and the white house may let them have it. But could a major russian arms deal with iran scuttle the whole deal . Ill speak live with senator jeff flake of the Foreign Relations committee and also our correspondents analysts and guests theyre standing by with all the latest developments but lets begin with the latest and go to our senior White House Correspondent jim acosta. Jim. Reporter this meeting between president obama and iraqi Prime MinisterHaider Al Abadi comes at a critical time as the white house is touting the gains of u. S. Led Coalition Forces in the fight against isis. The terror group is trying to seize control of iraqs Largest Oil Refinery. Isis posted this video. Well put it up on screen showing its fighters in this siege at the Beiji Oil Refinery north of tikrit. The video shows militants firing weapon huge plumes of smoke and portions of that refinery on fire. Wolf i can tell you from talking to a senior iraqi official that one thing that Prime Minister abadi said to the president during his meeting, his other meetings at the white house is that he would like to see increased air strikes on isis targets, the iraqis are pointing to the siege at beiji as a key reason of why they need to see that enhanced air power coming from the u. S. Led coalition. The president in the oechl office with Prime Minister abadi earlier was asked whether or not the u. S. Would be providing more weapons to the iraqis namely drones Apache Helicopter f16s and the president said thats why hes here. Hes here to listen to the iraqi Prime Minister. Heres what he had to say. I think this is why we are having this meeting to make sure that were continually improving our coordination to make sure that Iraqi Security forces are in a position to succeed in our common riggs. Reporter now, as for that assault on the Beiji Oil Refinery a senior iraqi official tells cnn they dont believe at this point that isis has control of that facility at this point though they do acknowledge that that attack and that siege has been taking place there. In the meantime, Haider Al Abadi, the iraqi Prime Minister is not leaving emptyhanded. The president announced during his oval office visit with the Prime Minister that the u. S. Is offering 200 million in humanitarian support to the iraqis and that there have been some reports, we should mention, wolf that abadi came to washington with specific requests for those drone, for those Apache Helicopters. The white house denied that abadi made that specific request of the president though the senior iraqi official told me wolf that they do have a longstanding request for the u. S. To purchase that type of military hardware. They say they need it and they need it badly, wolf. 200 million in u. S. Economic assistance to iraq. I wonder how thats going to be received up on capitol hill during these types of tight money as they say. All right, jim, thanks very much. Theres one thing that Congressional Republicans and democrats agree on they want to supervise any final nuclear deal with iran and now looks like theyll get their way. If if theres still a deal to supervise. The latest serious complication russia russias now moving to go ahead with the sale of sophisticated missiles to iran. Lets go to our chief National Security correspondent jim sciutto. Jim, first of all about this senate legislation, whats the latest. Reporter i tell you josh earnest said the president is not particularly thrilled with the legislation but he indicated he will sign it. In fact hell almost certainly have little choice. Senate Foreign Relations committee unanimously approving the bill 190 vote. It will now go to the senate. The full senate later this month where it appears to have the support of a vetoproof majority. After months of the white house fighting to keep lawmakers out of the Iran Nuclear Negotiations today congress forcing its way in. More fully than that i believe congress should play a role an in ensuring that all the details that need to be in place are there. Reporter republicans and democrats united behind a compromised bill giving lawmakers oversight of any final agreement. I think its the congressional prerogative and were the ones that impose the sanctions and take it up for changes. Reporter under a compromise struck between corker and cardin the original 60day review period cut to 30 days. And a Provision Requiring the president to certify every 90 days that iran is no longer backing terrorism against americans, watered down to periodic reports on irans terror and missilerelated activities. Faced with what looks increasingly like a vetoproof majority in the senate today the white house said the changes appear to be enough to merit the president s signature. The republican chairman working with the democratic Ranking Member ben cardin have agreed to address a large number of the concerns that weve raised and provide the kind of clarity we need to give our negotiators the time and space to try to reach an agreement. Reporter for iran however, congressional action injects new doubts into already difficult Nuclear Talks and highlights a key sticking point. Sanctions. As long as this instrument of you are jens and pressure is kept i think people will never have the peace of mind that is needed in order to implement a good agreement. Reporter the iran deal is already an issue in the 2016 president ial race. Today republican candidate marco rubio agreed to remove his amendment that would have required iran to recognize the state of israel. He removed that amendment because he didnt warrant to stand in the way of what looked to be a unanimous approval here. I i will tell you iran watching capitol hill closely today i was just in touch with a Senior Iranian diplomat for reaction to the passage of this legislation, heres what he told me. If we reach a deal it is the u. S. Administration not any other entity in the states which is responsible to do its commitments based on the agreement we only deal with the administration and expect it to deliver by any method it deems appropriate. So wolf there, the iranian side saying hey, mr. President , if youre making this deal with us we expect you to follow through on this deal regardless of what happens on capitol hill. Lets see if there is a deal. They still got 2 and a half months to negotiate it. The fine points will be significant. Russia meanwhile as you know jim, is going ahead and delivering surfacetoair missiles to iran how much of a complication potentially could this be even when the sanctions are theoretically still supposed to be in effect. They announced a major missile sale to iran. Reporter this has enormous implications. This is the missile here the s300. Advanced missile system. What is it designed to do take down lowflying aircraft and lowflying missile, the kind of weapons the u. S. Or israel might use if these talks fail to strike Iranian Nuclear sites. Now, im told that the s300. U. S. Warplane u. S. Technology could likely get by it. Israeli technology could not. Of course theres a scenario where the u. S. Decides not to strike. Israel does. But theres another implication here because these missiles could be used to protect iranian medium missile sites that could threaten europe so implications for nato as well and shows you that relationship always precarious. Russia involved in these talks but quickly injecting some untemperature not just about iran but for nato going forward. Jim, thanks very much. Lets get more on whats going on. Joining us now jeff flake of arizona. He a member of the Foreign Relations committee. Senator, thanks very much for joining us. Lets get through some of these points. First of all, the white house announcing 200 million in what is being described as humanitarian aid to iraq. Iraq after all is a pretty oilrich country. You support 200 million giving 200 million to iraq . Well ill have to see the white houses justification for it. Many of us will sit down with the Prime Minister tomorrow and see what justification he has and well weigh it against other priorities that we have. A lot of domestic priorities. Can you do a lot with 200 million back in arizona, for example, right . Sure sure and so theyll have to justify it and i think itll be a tough sell. But as of right now you have an open mind . Yes, yeah certainly well hear them out. But itll be a tough sell. What about providing iraq with more heavy artillery. More Apache Helicopters. Are you supportive of that given iraqs military coordination relationship with iran . Well weve committed to help iraq to stand up that government and make sure it prevails against isis and, you know we dont want u. S. Troops on the ground obviously but weve committed to help them in other ways and that would be another way. I think that youd find pretty broad support to supply arms and munitions. Because a lot of experts say the iraqis even under this new Prime MinisterHaider Al Abadi who is at the white house today they still have an incredibly close relationship with tehran and i wonder if that worries you. Oh it does. Obviously thats a concern and weve seen in the battles in tikrit and other places that theres been heavy iranian influence, so is isis so we have to play those priorities against each other and make a decision. The question is for the iraqis as you know when isis came into mosul in the second largest city in iraq, 2 Million People there, the iraqi army simply fled and they left all sorts of u. S. Military equipment behind in the hands of isis right now or in the hands of other terror groups. I wonder if Apache Helicopter heavy artillery. How concerned are you that the Iraqi Military could simply flee once again and leave all that military hardware to isis or the iranians or shiite militias or other terror groups. Its been a longterm concern of ours that the Iraqi Military hasnt been you have to snuff and they seem to be getting better. Certainly the new government is helping there. But as we go along well get recommendations from our own department of defense and that of our ally as well so were into the going to do this if we believe there is a good chance it will fall into the hands of isis. If we think that itll help win the battle well provide it. A lot of u. S. Military personnel are distraught when they see isis forces driving around in americanmade humvees and tanks that the u. S. Left behind when they pull the out of iraq and now in the hands of isis. Lets talk about the breaking news isis claiming it now trees iraqs largest 0 oil refinery in beiji so despite the victory socalled victory in tikrit is the army Strong Enough to fight isis and how worried are you . They obviously havent been on their own and thats why they needed help from us. From our allies and oddly enough from iran as well. And so no they havent been Strong Enough. We hope that theyre gaining strength as isis seems to have been beaten back in certain areas. But it remains to be seen and its a big concern of ours certainly the strength of the iranian or im sorry the Iraqi Military and ask that of the Prime Minister tomorrow. Im sure youll have good questions for Haider Al Abadi. We invited him to join us on cnn. So far they havent been able to find enough time for him to do an interview with me. Lets see if that changes over the next few days and would be good to hear him answer questions on these sensitive issues given the u. S. Involvement in iraq going back to 2003. Senator, we have a lot more to talk about including what happened today in the senate Foreign Relations committee on iran. Lots more with senator jeff flake when we come back. Back with republican senator jeff flake of arizona. He is a member of the senate Foreign Relations committee. President obama says now according to the white house hes willing to sign that Corker Cardin compromise legislation as it stands now that would give congress a say in any nuclear deal worked out with iran. Who blinked in these negotiations because you know going into the 190 unanimous vote the white house said they hated this and threatened the president might veto it. Well my advice to them all along was to work with them rather than deny that congress has any role. Congress imposed the sanctions and only congress can lift them permanently. So we always had a role and im glad the white house recognizes that now. So you think the white house blinked . Yes, certainly. All right, lets talk about aqap leader at the naval base in guantanamo bay. He was killed in yemen according to the terror group by a u. S. Drone missile. He was released from gitmo in 2006 under president bush. Heres the question. Looking back at all of the gitmo detainees who have been released a lot of them simply go back and go out there on the terror field, right . Yes, thats been the case. You have a problem with releasing detainees from gitmo . Well obviously we cant hold them forever and theres a process they did through and youre always going to have some that go back to the battlefield. There are some criminals released from prison who go back to crime but i do think it behooves us to make sure that we have a process that tryies to the best extent possible that they dont. You dont have a problem with the u. S. Using hellfire missiles on these drones lets say in yemen to look for these guy, go out and target them and kill them . No i dont have a problem with that. Obviously theres a process there that we try to ensure that weve got the right people and that we have minimal, you know that theres minimal Collateral Damage obviously and thats a process that we ought to go through but dont have a problem targeting terrorist. Were you surprised the u. S. Was able to do this in yemen even after yemen has become this horrible situation now, the u. S. Embassy has been evacuated, all u. S. Military personnel have been pulled out but somehow the u. S. Still manages supposedly to pull off an air strike like this with a drone missile . No im note surprised. We do have intelligence in those areas and we can continue to carry out these strikes and i think we should. Lets talk about cuba. I know you visited cuba. You are a supporter of an effort to reach out and try to improve the relationship after all of these years. What do you think of the president s decision today to submit word to congress that he wants to take cuba off the list of countries that sponsor terrorism . I think its a good move. That list ought to mean something and it means more now than it did just before the president made this action. I think its a good move. It hopefully will lead to full diplomatic relations and then well be able to put more pressure on the cubans frankly on areas that we have disagreement on. So you would say this move today is long overdue. Yes, long overdue. You know theres a lot of other republican some democrats like bob menendez who totally disagree with you v you been getting grief on your position. I know they dont agree with me on this issue, but i think it was a right move to take and im glad the president did it. Senator flake, thanks very much for joining us. Thank you. Jeff flake of arizona, the Foreign Relations committee. 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