Trump will hold a press conference momentarily
Watch out for comments
The main item to watch out for is Hong Kong/China talk. If he gets serious about retaliating for China's roundabout of Hong Kong law then it could hit risk trades.
This was a last-minute announcement and the White House doesn't have a link up yet but I'll track one down before he starts. The scheduled time is in 1 pm, which is right now but he's generally at least a few minutes late.