https://www.washingtonpost.com/news/reliable-source/wp/2016/04/11/mark-harmon-spotted-outside-white-house-says-ncis-will-film-there-with-michelle-obama/

Mark Harmon was spotted Sunday outside the White House, telling a photojournalist who recognized him that the first lady (http://www.hollywoodreporter.com/live-feed/first-lady-michelle-obama-set-886610) will be part of a scene that NCIS is shooting today.

http://www.theguardian.com/tv-and-radio/2016/apr/27/why-michelle-obama-appearance-on-ncis-will-be-a-disaster

Presented with the opportunity to promote her Joining Forces initiative on one of TV’s highest-rated shows, the first lady’s appearance sounds like "an incredibly dry government-sanctioned infomercial,” as Stuart Heritage notes. Obama would’ve been better off doing something on NCIS that's more attention-grabbing.