the stars. whether it rains or whether the sun shines. reporter: on tuesday the president and first lady are expected to arrive here at the national memorial site. to take part in a ceremony marking the 17th anniversary of the 9/11 attacks. eric: the quiet rain and somber gray skies certainly seem fitting for this special and meaningful memorial. thank you. arthel? arthel: very, very special. there has been so much news out the you might have missed this one. happening late last week, the leaders of facebook and twitter, back on capitol hill. the failures they admitted to and the changes they are making to get rid of bots and hackers trying to influence your political stances. >> at facebook, we're investing in security for the long-term.