Waterloo Man Convicted After Threatening Iowa Senator

WATERLOO, Iowa  --  A Waterloo man accused of threatening Iowa senator Joni Ernst could spend the next 15 years in prison.

On Wednesday morning, a federal jury in Cedar Rapids convicted 34-year-old Joseph Dierks of sending threatening communications.

Police arrested Dierks in August after he sent three threatening tweets to the senator. One included a link to scene in a movie showing a man shooting a woman in the head.