serena marshall, abc news, havana. >> president obama at that baseball game was talking about one ofproudest moments in office was when boston united following the attacks there. he pointed specifically to red sox david ortiz for saying they won't be intimidated. >> he's getting a lot of heat for going to the game. i distinctly remember in the days following 9/11 president bush was saying go on with your lives, go to disney world. spend money. do not let them disrupt our lives at all. >> broadway opening up shortly after the attacks to message to say they will not have this one over people. >> there was a moment of silence at the game and there will be on capitol hill today. a lot of people remembering what is going on in belgium. coming up, terrorists and technology. >> the battle to track suspects electronically is getting even more difficult. that's next on "world news now." >> announcer: "world news now" continues aft >>> welcome back. as investigators dig deep into how the brussels terror attacks were coordinated a new turn in the latest deadly case at home. >> apple is refusing

serena marshall was there is. >> reporter: it was a monday fun day at the white house.al easter egg roll. >> this is always one of our favorite events of the year. it's so much fun. >> reporter: the event in its 138th year could put some state dinners to shame. featuring the national anthem sung by idina menzel. ♪ and the rockets red glare >> presidential escort by none other than storm troopers and appearances by athletes including shaq on the basketball court. the obamas even treat ago the kids to an animated reading of "where the wild things resolution." they roared their terrible roars. let's hear a roar. roar. >> you can do better than that. >> one more time. roar. you don't have your claws up. >> reporter: families from all 50 states partake in a lottery to be one of the on the south lawn for the white house's biggest event. activities like yoga and soul psych were part of the day's fun. tying into the first lady's let's move campaign. it also included the first ever fun run around the white house lawn. >> you've got it. run hard. you're almost there. >> reporter:

serena marshall, abc news, washington. >> thank you. and president obama is going forward with his plan top nominate a supreme court justice for the victory say created after the death of antonin scalia. he's said to be interviewing at least five potential nominees. republicans on capitol hill not get a hearing or a vote. >> there hasn't been a vacancy created in an election year in 80 years. there will not be fill this had year. we will look forward to the american people deciding who they want to make this appointment through their own votes. >> but according to an abc news/washington post poll poll, 63% of americans do not think the selection be process should be stalled. president obama says he expects that the senate will do it as outlined in the constitution. >> police outside of pittsburgh are searching for two men hon opened fire at a backyard cookout killing six people including a woman who was eight months pregnant. three of the victims were is siblings and two others cousins in the suburb of wilkinsburg, violence. authorities

as serena marshall reports, his stop in cuba is still very much >> reporter: president obama's final day in havana, markds by far away disaster. the look of horror as he learned about the brussels attack. hours later addressing the cuban people but only a brief mention of the bombing. >> the thoughts and the prayers of the american people are with the people of belgium. >> reporter: before continuing his cuban push. >> i have come here to bury the last remnant of the cold war in the americas. >> reporter: the president pleating with dissidents and using baseball diplomacy as the two leaders watched, joked and took in the baseball traditions, obama telling espn why he didn't go home immediately as political rivals suggested. on a day marked by tragedy watching the game was so important. >> what they can doing is scare and make people afraid and disrupt our daily lives and divide us. and as long as we don't allow be okay. >> reporter: ending his day in cuba with castro seeing him off. landing overnight, he will spend the next two days with newly elected president mauricio macri macri.

abc's serena marshall has the latest. president barack obama and canadian prime minister justin trudeau in d.c. for the first state visit by a canadian prime minister in almost 20 years. >> cheers. >> reporter: from a star-studded state dinner that included a performance by sara bareilles. to the official arrival ceremony fawning over a baby, and trading a few friendly jabs. >> there's some things we will probably never agree on. whose beer is better, who's better at hockey? where is the stanley cup right now? >> reporter: the bromance turning into #truebama. the dynamic panda loving boxing 44-year-old often compared to obama both campaigned on a message of hope and change. to count on a friend who has lived through many of the things that i'm about to encounter on a international stage, it's a >> reporter: the two leaders recommitting to the u.s./canada relationship including new emissions from gas and oil production. obama reassured trudeau although searches for moving to canada are up, his country was safe from the an

serena marshall, abc news, washington. >> thank you. and president obama is going forward with his plan top nominate a supreme court justice for the victory say created after the death of antonin scalia. he's said to be interviewing at least five potential nominees. republicans on capitol hill insist anyone he nominates will >> there hasn't been a vacancy created in an election year in 80 years. there will not be fill this had year. we will look forward to the american people deciding who they want to make this appointment through their own votes. >> but according to an abc news/washington post poll poll, 63% of americans do not think the selection be process should be stalled. president obama says he expects that the senate will do it as outlined in the constitution. >> police outside of pittsburgh are searching for two men hon opened fire at a backyard cookout killing six people including a woman who was eight months pregnant. three of the victims were is siblings and two others cousins in the suburb of wilkinsburg, known for drug tra