(NB: I'll list the three investigations, then explain them.)
1) The best reporting on it is in foreign media.
2) Our media consistently "buries the lede" in reporting on the story—as it considers America not ready for it.
3) The story is so complex it's taken over a year to research.
1) Six nations hatched a plot to elect Trump. The plot was hatched in 2015; the nations involved were Russia, Israel, Saudi Arabia, the UAE, Bahrain, and Egypt. The leaders of these countries were all involved.
2) Three of these six nations—Russia, Israel, the UAE—had infiltrated deep into the Trump campaign by March 2016: Russia through Dimitri Simes; the UAE through Yousef al-Otaiba; Israel through Kushner, Groner, and Birnbaum. The campaign understood the plan these nations had.
3) The plan was simple: historic detentes between the US and Russia and the Sunni Arab Gulf states and Israel; the US drops all sanctions on Russia and Russia agrees to withdraw support for Iran, thus clearing a path for a new Arab-Israeli alliance to remake the Middle East.
4) The Trump campaign became aware of the plan via *many* interlocutors: Kushner; Flynn; Nader; Manafort; al-Otaiba; Simes; Birnbaum; Barrack; others. The plan was seen as a "grand bargain" and sometimes called that—other times it was called "the Middle East Marshall Plan."
5) Russia began operations in what would become the plot (through the GRU and IRA) in 2014, at a time it was in a *massive* new joint investment program with the UAE and there were regular high-level Moscow/Abu Dhabi contacts. The UAE and Russia knew Trump would run by 2013.
6) By March 2016, Russia had become the first nation with a "man in"—Dimitri Simes. (Though you could argue Kushner saw himself as an unofficial agent of Israel prior to that). By April 2016, Israel had a "man in"—via Birnbaum. By May 2017, UAE had a "man in"—with al-Otaiba.
7) Saudi Arabia (whose leader, MBS, is a mentee of the UAE's MBZ); Egypt (whose leader, el-Sisi, is in power because of the UAE's MBZ); and Bahrain (whose leader is basically along for the ride), did not *need* their own agents, as they effectively were using the Emiratis'.
7) The conspirators spent March through July trying to get access directly to the Trumps, though Jared Kushner was conspiring with Simes, al-Otaiba, and Netanyahu's office by late spring. On August 3, 2016, agents of Israel, Russia, the UAE, and Saudi Arabia got to Trump Jr.
8) At that August 3 Trump Tower meeting, both the family and campaign were represented: the family via Don Jr., the campaign via Trump's chief domestic policy adviser, Stephen Miller.
Four nations offered the Trump campaign illegal pre-election assistance; Don Jr. said yes.
INVESTIGATION #1: Israeli intel expert Joel Zamel offering illegal pre-election aid to Trump's campaign.
INVESTIGATION #2: UAE/Saudi agent George Nader repeatedly meeting the Trump team secretly in last 90 days of campaign.
INVESTIGATION #3: UAE agent Broidy bribing Trump.