President Trump said that former President Obama "had to know" about what he believes was a "high-level efforts" by the FBI to undermine his presidency.Speaking to George Stephanopoulos on ABC's "This Week", President Trump insisted that prosecutor Robert Mueller's report exempted him from accusations of complicity with Russia and accused the FBI of working against him."There was no crime. There was no collusion, "said the president. "Now, there is no collusion. That means it was a setup. In my opinion, and I think it's going...