Special Counsel Robert Mueller is digging deeper into Erik Prince, an ally of President Donald Trump's and founder of military contractor Blackwater, ABC News reported. Prince acknowledged last week he cooperated with Mueller's investigation of Russian interference in the 2016 presidential election after he came under scrutiny amid questions about an alleged effort to set up a backchannel between the Trump administration and the Kremlin--something Prince has denied. ABC said Mueller is also reviewing Prince's communications and that Prince's spokesperson has given Mueller "total access to his phone and computer." Prince's sister Betsy DeVos is Trump's education secretary.