WASHINGTON AP - News that Attorney General Pam Bondi is moving to criminally investigate the Obama-era origins of the Trump-Russia investigation means that one of the most studied, and politically polarizing, chapters of modern American history will be under the microscope yet again.
Here's a look at what's known and not yet known about the latest Justice Department revelation:
A saga with a long backstory
Perhaps no issue continues to aggravate President Donald Trump more than the assessment by intelligence officials that Russia interfered in the 2016 election on his behalf and the investigation by law enforcement into whether his campaign colluded with Moscow to tip the outcome of the contest.
Robert Mueller, the former FBI director tapped as special counsel by Trump's first Justice Department to investigate, found that Russia had waged a multi-prong operation in Trump's favor and that the Republican president's campaign welcomed the aid. But Mueller did not find sufficient evidence of a criminal conspiracy between Russia and the Trump campaign.