In his first television interview as Homeland Security secretary, retired four-star Marine Gen. John F. Kelly told Fox News he wants the U.S.-Mexico border wall finished in two years – setting an ambitious schedule for the project ordered last week by President Trump. "The wall will be built where it's needed first, and then it will be filled in. That's the way I look at it," Kelly said. "I really hope to have it done within the next two years." Fox News traveled with Kelly in McAllen, Texas, on Wednesday where he saw first-hand the challenges for Border Patrol agents....