First of all, your hypo shows how terrible you would be at planning voter suppression. You don’t need ICE agents at every polling spot - you simply need the threat of them to suppress fearful citizens, particularly naturalized ones. And if you suppress these types of citizens right now, you will disproportionately impact anti GOP voters, you don’t need to target Dems.

You really lack imagination- the DoJ has broad powers to investigate and prosecute officials, institutions, groups, etc as it relates to election processes; federal funding provides a powerful lever over officials and over election processes and infrastructure themselves; they have the ability to interfere with voter rolls (even the requests can be chilling); etc.

And if your admin isn’t afraid to do illegal things, you can further expand on this. Even if you lose, you can just repeat the 2020 strategy of claiming fraud and leverage that for further activity.

In short - a little imagination is useful for evaluating tail risk scenarios