The U.S. Attorney General decided that President Donald Trump did not obstruct a probe into whether his campaign colluded with Russia, but some legal experts said prosecutors laid out a wealth of evidence to the contrary and that they intended to leave that determination to Congress. Special Counsel Robert Mueller's report revealed new details about Trump's attempts to impede his investigation on Thursday. They included how the president tried to fire Mueller and limit his investigation, kept details of a June 2016 meeting between senior campaign officials and a Russian under wraps, and possibly dangled a pardon to a former adviser.