An Iowa man was sentenced Wednesday to six years in a federal prison for posting threatening Twitter messages directed at U.S. Sen. Joni Ernst.
Joseph Hilton Dierks, 34, of Waterloo, sent Ernst several threatening tweets in August, including one that suggested he would shoot her, authorities said.
After the tweet was posted, U.S. Capitol Police contacted the Waterloo police, and officers sent to Dierks' home said he promised to "tone it down."
But Dierks resumed posting threatening messages within 24 hours, authorities said.
At the sentencing in Cedar Rapids, a judge noted Dierks' criminal history, which includes a prior conviction for harassing a Waterloo police officer and carrying weapons.