WATCH: Peter Alexander fact checks Pres. Trump's unfounded claim that Pres. Obama didn't call families of fallen US service members. http://nbcnews.to/2gmBaN4 | NBC Nightly News with Tom Llamas

THE GREATEST GENERATION: President Barack Obama meets with World War II veteran Emma Didlake in the Oval Office. At 110 years old, Didlake is America's oldest living veteran and is the recipient of numerous commendations for her service during the war. | NBC Nightly News with Tom Llamas

Girl Scouts troop steals the show while speaking with President Barack Obama at The White House Science Fair http://nbcnews.to/1N7oaOM | NBC Nightly News with Tom Llamas

“If you're walking down the right path and you’re willing to keep walking, eventually you'll make progress.” - Barack Obama, born on this day in 1961. | Biography