Department of Government Efficiency (DOGE) Senate Caucus Chairwoman Joni Ernst reveals to Fox News Digital how she’s keeping close contact with billionaire Elon Musk as he spearheads Trump’s aggressive agency spending audit. Department of Government Efficiency (DOGE) Senate Caucus Chairwoman Joni Ernst reveals to Fox News Digital how she’s keeping close contact with billionaire Elon Musk as he spearheads Trump’s aggressive agency spending audit.