john kirby, thank you very much. so this will be the first formal prime time address to the nation by president trump. he's going to unveil his long awaited plan for the nearly 16 year long war in afghanistan. cnn's sara murray live at the white house with more. what do we know? >> reporter: good morning, chris. this prime time address is going to be a huge moment for president trump. it comes at a time when his credibility, when his character, when his ability to lead is under question by many americans, he's going to have to stand up tonight and convince them that his strategy is the right path forward for afghanistan. >> it's a very big decision for me. i took over a mess and we're going to make it a lot less messy. >> reporter: president trump set to outline his strategy for america's path forward in afghanistan. a major test for the new commander in chief. one that could put more american troops in marms way. after meeting with top administration officials at camp david on friday, the president