DOJ opens investigation into Trump ally Corey Lewandowski

What happened: The Justice Department has opened an investigation into longtime Trump adviser Corey Lewandowski, a source told Fox News. The probe stems from a criminal referral by the Department of Homeland Security's inspector general. Why it matters: President Donald Trump said he wants his staff held accountable and that dishonest staff "have to be prosecuted." A representative for Lewandowski said he has not been contacted by the DOJ and denied any wrongdoing.

The Justice Department has opened an investigation into longtime Trump adviser Corey Lewandowski, a source told Fox News. The probe stems from a criminal referral by the Department of Homeland Security's inspector general.

President Donald Trump said he wants his staff held accountable and that dishonest staff "have to be prosecuted." A representative for Lewandowski said he has not been contacted by the DOJ and denied any wrongdoing.