Special counsel Robert Mueller's team is asking witnesses to turn in their phones in order to access encrypted messaging applications, sources tell CNBC. Mueller's team has indicated it wants to examine private conversations on WhatsApp, Confide, Signal and Dust, sources say. Fearing a subpoena, the witnesses have complied with the request and have given over their phones. Special counsel Robert Mueller's team is requesting that witnesses turn in their personal phones to inspect their encrypted messaging programs and potentially view conversations between associates linked to President Donald Trump, sources told CNBC. Since as early as April, Mueller's team has been...