Facing the possibility of big losses for Republicans in the midterm elections, President Trump has reiterated his unfounded assertions of electoral fraud. He has also begun speaking of the need to “nationalize” elections, and for Republican officials to “take over” voting procedures in parts of the country. This rhetoric is often vague, coming across as a hint of plan, rather than an actual one. But a map of potential targets may be coming into focus and includes the swing states Michigan, Georgia, North Carolina and Arizona. Voting experts, government officials and others have identified a host of conditions that could make those places ripe for meddling from the Trump administration or its allies.