[ airplane engine whines ] [ grunts ] [ dog barking ] gah! [ children shouting ] [ grunts ] [ whacking piñata ] [ whacking piñata, grunting ] welcome back to msnbc. i'm peter alexander in for contessa brewer. mexican police intercepted two trailer trucks headed for the u.s. packed with 513 migrants. they were discovered using x-ray equipment at a border checkpoint. also, the space shuttle