Trump's conviction is unlikely to weigh much on the US market overnight, other than the fact that market sentiment is already waning so that news won't help.
What is more important would be July 11 when the sentencing would be known, only a jail term which most believe unlikely (though can't be ruled out), would bear a more notable effect on the markets.
The bigger concern I believe is that the unfolding of events is adding greater uncertainty to the markets- that a black swan event of a disorderly election process/outcome becomes an increasing possibility.
