This statement by Trump seems to indicate he knew about Junior's meeting with Russians in advance, but no one seems to be referencing it.
I have always found this statement, made as part of his primary victory speech, to be very damning as to what Trump knew and when he knew it. And yet it does not seem to be getting much play in the (limited) news feeds I follow.
To refresh your memory on the timeline of events leading up to the June 9 2016 meeting at Trump Tower between Junior/Kushner/Manafort and some Russians here are the highlights:
June 3, 10:36 a.m.
June 3, 10:53 a.m.
June 7, 4:20 p.m.
June 7, 5:16 p.m.
June 7, Evening
As you can see from this timeline the time and date for the Trump Tower meeting was set on June 7. The purpose of this meeting, as far as Junior knew, was to "provide the Trump campaign with some official documents and information that would incriminate Hillary". Trump, who can not keep a secret, boasted (within hours of the meeting being confirmed), that he would have dirt on "the Clintons" early the next week.
As we know, the June 9 meeting did take place and was a big nothing-burger. And as we also know, Trump never made his "major speech" on Monday.
Anyone who thinks Junior did not run to Daddy and tell him of the impending meeting is fooling themselves.