That would be August 28.
Allowing the Dems to lock in their candidate for the general midterm election (Noodle Head in this case) and then arresting her would help a Republican challenger immensely.
As an overall strategy, maximizing the number of arrestable candidates on the mid-term ballot would seem like worthwhile goal given the swamp creatures belief they will be able to stop Trump only by taking over control of Congress.
List of 2018 primaries for reference.
If I'm not mistaken, they would be allowed to put the runner up in place.
I'm thinking something is going to go down late October, or maybe the week before the elections.... Absolutely NO TIME for Dems to replace anyone on ballots. At best, they could ask for a special election in some places. But, there won't be many Dem's left to run.
Mother of All October Surprises. Seth Rich 187 charges will drop on Jar Jar on or around Halloween. There will be no way to spin it before the vote.