i'm ann mare-marie green, this the "cbs morning news." to look at me now, you don't see psoriasis.ee clear skin. cosentyx can help people with moderate to severe plaque psoriasis find clear skin that can last. don't use if you're allergic to cosentyx. before starting, get checked for tuberculosis. an increased risk of infections and lowered ability to fight them may occur. tell your doctor about an infection or symptoms, if your inflammatory bowel disease symptoms develop or worsen, or if you've had a vaccine or plan to. serious allergic reactions may occur. how sexy are these elbows? learn the signs at autismspeaks.org. >>> our top story this morning, president trump resumed his attack on robert mueller. that's after his claims. in a c"cbs this morning" exclusive, attorney general william barr said mr. mueller could have determined whether or not president trump obstructed justice. >>> there's a painful new ending in mobile, alabama. omar villafranca shows us how a grim discovery tells the story of america's last slave ship. >> reporter: along the mobile river, ben raines took us