Preview of your snail mail. Finally. This is the cbs evening news with scott pelley. Pelley today, the United States dropped the largest nonnuclear weapon the u. S. Has ever used in combat. Ground zero was afghanistan. The pentagon says the target was isis. But the impact could not have been lost on the young dictator of north korea. Kim jongun is deciding whether to celebrate his countrys biggest holiday on saturday with a missile or nuclear test. Asked whether he was sending a message to north korea, President Trump said today, it doesnt make any difference. That problem will be taken care of. More now from david martin at the pentagon. Reporter the bomb, all 21,600 pounds of it, was aimed at the center of an isis cave complex in afghanistan. When it detonated at 7 32 in the evening local time, it set off a massive pressure wave that would have literally crushed the life out of fighters hiding in the caves. The massive ordnance airblast, as it is officially called, sent a mushroomlike cloud towering into the sky. John nicholson, the u. S. Commander in afghanistan, said he used the bomb so afghan troops and their american advisers wouldnt have to go in on the ground to clear up on the the caves. There are an estimatey 600 to 800 isis fighters in afghanistan, most of them located in an area right across the border from pakistan. Pentagon officials said the strike had been in the works for months, and that the bomb itself was moved into afghanistan during the obama administration. Authority to use it had been delegated to general nicholson, although he notified washington in advance. As shown in this 2003 test, the bomb is dropped from an mc130 aircraft using a parachute to drag it out of the cargo bay. The sled detaches and the bomb falls to earth, guidelined by a g. P. S. System diseend to be accurate within 10 yards. This test, conducted on open ground, shows the pressure wave set off by the bomb. It was specifically developed to attack cave complexes and for its pure terror effect. Meanwhile, scott, the war against the taliban in afghanistan greendz on into its 17th year. General nicholson recently called it a stalemate and said he needs a few thousand more troops. Pelley david martin reporting from the pentagon tonight. David, thank you. Now, we mentioned a moment ago that north korea is about to celebrate a major holiday and is considering a weapons test of its own. Our ben tracy is in the north korean capital. Reporter these new satellite images show that north korea may be preparing to conduct its sixth nuclear test. A u. S. Based Watchdog Group says the country is primed and ready after analyzing telltale signs of activity at the remote underground test site. Exploding a more powerful bomb or launching a new Ballistic Missile could be timed to coincide with this weekends celebration of north koreas founder, often marked by a massive parade in which the country is not subtle about showing off its military might. Kim jongun, the current north korean leader, made an appearance in pyongyang thursday in front of a crowd so large, it appeared to be everyone who lives in the city. He cut a ribbon to officially open a newly built neighborhood with more than a dozen new high rises, some 70 stories tall. Its an attempt to show economic progress in a country where the reality is that most people live in poverty. Kim jongun did not speak at this event but he didnt have to. He let these buildings do the talking, and his message to america is, your sanctions dont work. We will keep building our buildings and our missiles. North koreas goal is a nucleartipped intercontinental Ballistic Missile, capable of reaching the United States, which experts now say they could accomplish in the next few years. That threat is now one of the most serious issues facing the trump administration. The president once again tweeted that he expects china to reign in north korea, or, scott, he says the u. S. Will. Pelley ben tracy in pyongyang. Another air strike in the u. S. Led war on isis has resulted in a terrible mistake. And the deaths of 18 soldiers who were fighting on americas side. The u. S. Military said today that allied arab fighters trained by the u. S. Appear to have mistaken Friendly Forces for an isis fighting position in syria. Only later did they realize that they had requested the airstrike on their own forces. Today, c. I. A. Director mike pompeo took aim at wikileaks, the organization that posts secret Information Online and was used as a weapon in russias cyberattack on the american president ial election. Nancy cordes has that. Its time to call out wikileaks for what it really is a nonstate hostile intelligence service, often abetted by state actors like russia. Reporter the c. I. A. Director did not hold back, accusing wikileaks of working directly with the russian government to release emails stolen from want Democratic Party and the clinton campaign. Our intelligence determined Russian Military intelligence, the g r. U. , used wick leaks to release data of victims that the g. R. U. Had obtaindz through sierk operations against the Democratic National committee. Reporter pompeo argued it is time to stop giving wikileaks a platform. Wikileaks, i love wikileaks. Reporter something President Trump did routinely on the campaign trail. Wikileaks also just released an email with bill clintons chief of staff. Reporter this afternoon, wikileaks reminded pom teo that he himself publicized their material last year. In a tweet the former congressman now says he does not remember sending. Wikileaks founder, julian assange, has insisted he is isnt prorussia. On russia and china, we have published hundreds of thousands of things, most of them critical. Reporter but pompeo argued its the u. S. Disclosure, like last months release of thousands of sensitive c. I. A. Documents, that are making the world less safe. We can no longer allow assange and his colleaguing the latitude to use free speech values against us, to give them the space to crush us with misappropriated secrets is a perversion of what our great agreement constitution stands for. Reporter its notable that this was the focus of pompeo sea first public address since being named c. I. A. Director by President Trump. Mr. Trump initially rejected the c. I. A. s conclusion about russian hacking, but, scott, were told the c. I. A. Did brief the white house about what pompeo was going to say. Pelley nancy cordes, thanks. About two weeks before the election, candidate donald trump put out what he called a contract with the american voter, a list of actions he said he would take in his first day and in his first 100 days. He wrote, this is my pledge to you. And he signed it. Well, this is day 84, and we asked Major Garretting to check on the state of the pledge. I like to think of myself as a very flexible person. Reporter just over a week ago, President Trump hinted at his receipt reversals of several Campaign Promises. On nato, candidate trump i said heres the problem with nato. Its obsolete. Reporter President Trump yesterday i said it was obsolete. Its no longer obsolete. Reporter how about china as a currency manipulator . In august im going to instruct my treasury secretary to label china a currency manipulator. Reporter but yesterday, the president told the wall street journal china does not manipulate its currency to hurt u. S. Workers, and his administration will abandon that pledge. As for china and its leadership overall, this was day one of the Trump Campaign chinas killing us. Reporter and this was day 84 of the Trump Presidency as you know, president xi is a terrific person. Reporter mr. Trumps stance on russia has done a 180 also. I dont know putin, but wouldnt it be nice if we could get along, actually . Reporter yesterday right now were not getting along with russia at all. Reporter on inauguration day, President Trump outlined his America First philosophy. We do not spea seek to imposr way of life on anyone. Reporter but wednesday, mr. Trump explained why he launched missile strikes on the Syrian Regime of bashar alassad. Thats a butcher. Thats a butcher. So i felt we had to do something about it. Reporter there have been promises kept, including the confirmation of Supreme Court justice neil gorsuch. And i got it done in the first 100 days. Thats even nice. The keystone pipeline. Reporter and approval of the keystone xl pipeline, as well as withdrawing the u. S. From a Free Trade Agreement with asia pacific countries. There is another big Campaign Promise the president is trying to keep, repealing obamacare. Hes tried new policies. Hes courted democrats. Hes even threatened republicans. But, scott, so far, no combination of president ial flexibility has produced the desired results. Pelley Major Garrett at the white house for us. Major, thanks. A federal judge has again struck down texas voter i. D. Law, ruling that it is actually meant to keep minorities from voting. The state is expected to appeal. And Omar Villafranca has more on this. Reporter 86yearold floyd carrier served his country in the army, but in 2012, he wasnt allowed to do his civic duty. He was denied the right to vote at the polling place near his beaumont, texas, home. You felt like you werent a citizen. I wasnt a citizen anymore. I wasnt. Reporter carrier says he wasnt ato vote because of a voter i. D. Law passed in texas in 2011, which required one of seven types of approved picture i. D. S to cast a ballot. For more than 50 years, carrier had used his Veterans Administration card that had no picture, but suddenly it wasnt enough. In 2012, federal judges ruled that the law violated the Voting Rights act but republican lawmakers fought repeatedly in federal government to keep the law in place, saying it prevented inperson voter fraud. But again this week, a federal judge ruled that want law was unexplainable on grounds other than race. Genay nelson is with the n. A. A. C. P. Legal defense fund. This new strict requirement is based on an idea that there is voter fraud in texas, and weve debunked that many times over. Reporter Texas Governor greg abbott responded on twitter saying, ytexas will appeal the erroneous voter i. D. Ruling by a liblg obama judge, and we should win. Supreme court has already approved voter i. D. Floyd carrier now has a valid picture i. D. , and hopes no one else is denied the right he fought to protect. To me, you have your right to go vote. Reporter if this latest ruling stands, scott, there are consequences. Texas elections could go back under federal oversight. Pelley Omar Villafranca, thanks. A nineyearold boy shot in his classroom is recovering well, according to his family. On monday, a gunman in san bernardino, california, shot his estranged wife who was a teacher, but he hit two children as well. The teacher and one student died. The gunman committed suicide. The violence recalled the horror at Sandy Hook Elementary School in newtown, connecticut. Its been four years since 20 first graders and six educatores were murdered. Recently, 60 minutes returned to newtown to speak with parents who can never move on but are finding ways to move forward. Among them, david and Francine Wheeler who lost their son, ben. A apparent who has lost a child has one fear left the end of remembering. And so many of the families have created projects that introduce their child to new people. Ben wheeler now lives in the work of bens lighthouse. His mother, francine, creates Service Projects for newtown kids. What a wonderful way to honor him and continue to be his parents. Pelley continue to be his parents. Yeah. I cant live the rest of my life not talking about him. I mean, imagine you having a sixyearold and then you dont anymore. Are you going to stop talking about them . The worst thing you can do to a grieving parent is not to mention the child. Then youre not acknowledging his existence. And so when people do acknowledge it, im so appreciative. I say, oh, thank you. And even if im crying, theyre like, im sorry i made you cry. Im like, no, you didnt make me cry. You brought him back. Its like having him back for a minute. Yeah. Reporter the wheelers wanted another child, a sibling for their oldest, and almost two years after ben was killed, Matthew Bennett wheeler was born. You try to make the world into the place you want it to be, and many times, the only area that you have any control over is the Square Footage of your own house. And so you do what you can. Pelley returning to newtown, this sunday on 60 minutes. Coming up next on the cbs evening news, heritage or hate . The debate over confederate monuments. Microsoft and its partners are using smart traps to capture mosquitoes and sequence their dna to fight disease. There are over 100 million pieces of dna in every sample. With the microsoft cloud, we can analyze the data faster than ever before. 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Reporter but opponents, led by attorney charles weber, argue the statue symbolize something else. You dont have to agree with the cause to understand that these men fought and died. Reporter weber point to a virginia law similar to others across the south that blocks cities and towns from removing war memorials. This statue could never be moved . It has to stay here . Yes. Reporter forever . Yes. Reporter even though many people find this terribly offensive . Offensive is the is a way to stop a conversation about the meaning of the statue all right. Its not a way to start the conversation. Reporter for years, these fights focused on the confederate flag, which largely has disappeared from public spaces. Here in charlottesville, memorials to the confederacy are all around. Opposition to change runs deep. Ive been told i should be taken behind the watershed. Reporter supporters of the statue unearth crude tweets written by bellamy as a younger man and he also was targeted with death threats, but bellamy feels his fight is justified weve seen theres stills lot of issues in regards to race here in this community, and the only way for us to move forward is to deal with them head on. Reporter a conversation many communities across the south are just beginning. Jan crawford, cbs news, charlottesville. Pelley up next, how badly hurt was napassenger yanked off the United Airlines flight . Thats why you drink ensure. With 9 grams of protein and 26 vitamins and minerals. For the strength and energy to get back to doing. What you love. Ensure. Always be you. I thought i neededgled cigarettes to cope. I was able to quit smoking, and then i started running. Now i feel a lot better. announcer you can quit. For free help, call 1800quitnow. Flea bites can mean misery for your cat. Advantage® ii monthly topical kills fleas through contact. 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