If President Trump has seemed to step up the rhetoric against Robert Mueller's investigation lately, sources say it's because he's worried the inquiry could hit close to home: Specifically, his son, Don Jr., reports the Washington Post. The president is worried that his son might have exposure in the Russia investigation, sources tell CNN, although he doesn't believe he intentionally broke the law. A Trump Jr. source tells CNN that he's not worried and maintains his innocence. The White House declined to comment, deferring to Rudy Giuliani, who said in a statement: "Just not so. After over a year or more of investigating ... there is no evidence of any wrongdoing on his part or for that matter POTUS. Nothing has changed. We are not worried about Michael Cohen because he has no knowledge of wrongdoing and has recorded it in one version or another so often that he can't be believed or relied on." (More President Trump stories.)