0 the prison is still open. >> to close the detention facility at guantanamo. we have succeeded on delivering a lot of campaign promises that we made. one where we have fallen short is closing guantanamo. i wanted to close is sooner. we have missed that deadline. it's not for lack of trying. it's not surprising to me that we have problems in guantanamo, which is why i campaigned in 2007 and 2008 and when i was elected in 2008 i said we need to close guantanamo. >> well, the president's speech comes as british authorities piece together the mission behind a brutal attack. a british soldier ambushed with a machete outside his barracks. here's british prime minister david cameron. >> this country will be resolute in its stand against terrorism. we will never give in to terrorism or terror in any of its form gls this follows new revelations that tamerlan tsarnaev may have murdered three people before he targeted a finish line. that's the early start on this thursday. national investigative respond micha michael isikoff and amon. calling it a counterterrorism speech for the history books that the president is going to give. during this year's state of the union address he discussed this very issue, saying that a range of capabilities against terrorism with the use of the latest information, we affirm that drones is a clear part of that. we got this information yesterday. what does admittance of that say about u.s. strategy, do you think? >> well, first of all, we'll have to see if the speech lives up to the hype that "politico" is giving it. clearly it has been known for years now that drones have been a major part of our counterterrorism strategy. in fact, the principle weapon we've used against the al qaeda core in pakistan, if a close reading of what we got yesterday from attorney general holder suggests that the president is tightening up the standards for those drone strikes. using the same standards that they would use if they were targeting an american citizen, which is that the terrorist target has to be a continuing imminent threat to the united states. now, there's a lot of wiggle room in how you define that but we do know from documents, which we reported on just yesterday, that the agency as has been amply discussed, uses these signature strikes where they go after military-aged males and other identified militants whose identities and even nationalities they don't know. if you applied this standard that attorney general holder is laying out in this letter, they wouldn't be able to do that. so this could mean a curling back or curtailing or even an elimination of these signature strikes which have been quite controversial. >> this will be the first time that the president discusses drones at length. he's expected to discuss why the use of drones is necessary, legal, and in his mind here, just. the drone use in the middle east, pakistan, for example, faces wide criticism. what might the response be about what has been developing over the last 24 hours and what the president might say? >> well, i think following up on michael's point, it's going to depend on how this is a shift in u.s. policy on the way that drones are used. there's a lot of domestic have the disclosure yesterday that jude mohammed was a north carolina resident, 22-year-old who had been under indictment was killed in a drone strike. i spoke to somebody close to his family today who said that the family had heard from pakistan from his then pregnant wife in pakistan that he was killed in this drone strike in 2011. november of 2011. so the fbi had jude mohammed up on its most wanted list as of yesterday saying he was in pakistan. it's not clear that the fbi knew that the cia had killed the guy they were looking for and the killing took place more than two years ago. so it does show when the government is this secretive about policies, you know, one hand of the government doesn't even know what the other hand is doing. in some cases, will undercut some of the recruitment tools that have been used by extremist groups across the region to try and recruit more followers into that ideology saying look at what the united states is doing to these people? you must carry out attacks. and certainly that is going to be a step back for that ideology, if indeed the u.s. can successfully close down guantanamo as it has promised to do the last couple of years. >> recent development, the boston bombings, the man killed in florida had spoken to authorities before his death there. you've done a lot of reporting on this. he has ties to the tsarnaevs. what may come of this? >> well, i think the first thing will come of it is what were the circumstances surrounding him t getting killed yesterday? here we have an unarmed individual meeting with three armed law enforcement officers, one from the fbi, two state troopers. exactly what happened in that room and why they thought -- why the law enforcement officers thought they were under attack or threatened there to cause lethal force, that is under an investigation by an fbi response team. i think there are a lot of questions surrounding that. that said, what we've been told is, this guy was about to sign a confession that he and tsarnaev were involved in this unsolved triple murder back in 2011. we don't know exactly what he said or what the evidence is, but suggesting tsarnaev's ties and activities were a lot broader and malicious than we even knew, even after the boston marathon bombing attack. >> and that remains outstanding. a nexus of headlines as the president comes to the microphone to speak on counterterrorism. michael isikoff and ayman, thank you. coming up after the break, we'll talk about the terror attack in london. knife-yielding men hacking a british soldier to death. president obama will visit moore, oklahoma this weekend to view the tornado destruction. we'll get a live report from craig melvin. plus, a major vote from the boy scouts. and drone dilemma, is the overseas targeting of americans justified in certain cases? 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