Like what? Like tell DHS to apprehend and investigate?
Or Tell DHS to increase surveilliance and detection activities?
Maybe you think the president should describe to DHS how they should do their jobs?
Maybe you think the president should describe to the counter terrorist organizations how they should do their jobs?
Maybe while he's at it, the president can tell GM how to build cars, Bank of America how to loan money, and doctors how to practice medicine!
Have you ever considered that some of these agencies and organizations can actually function and perform their missions well even when Obama isn't personally directing them?