Canada limits US livestock imports, Trump promises lower farm costs It’s another big week as Agriculture Secretary Brooke Rollins grapples with a threat to livestock, senators work on a farm bill, and President Donald Trump says he’s focused on ending war with Iran and lowering costs for ag producers and other Americans. Rollins will travel to Kerrville, Texas, to visit the new Knipling-Bushland U.S. Livestock Insects Research Laboratory, which works to control livestock arthropod pests.