Already planning for a GOP president in 2017, Sen. Ted Cruz sent a letter Monday demanding that the Justice Department preserve all documents from its completed investigation into the IRS's tea party targeting, saying too many questions still remain. Mr. Cruz, a Texas Republican who is himself seeking his party's presidential nomination, said the department's decision to close the investigation and clear IRS employees of any wrongdoing was a sign of just how broken the Justice Department has become. "It is important for you and other officials in this Administration to understand that this administration's decisions to neither continue this...