LINCOLN, Neb. —

Nebraska's top lawyer put a Swiss billionaire in his sights on Wednesday, announcing a lawsuit to shut down what he called "an unprecedented assault of foreign money" influencing state politics.

"What we have found is really a scandal hiding in plain sight," Hilgers said. "We have a billionaire from Switzerland by the name of Hansjörg Wyss, who has spent a half $1 billion in United States that have flowed into elections around the country and a massive amount, relatively speaking, a massive amount of those dollars have flowed into Nebraska."

Hilgers unveiled a flowchart, showcasing what he says is a trail of dark money from Wyss, who is worth up to $12 billion, through foundations and onto advocacy groups and ballot initiative campaigns.

"We do not want foreign funding

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