https://motherboard.vice.com/en_us/article/zm8q43/paul-manafort-icloud-whatsapp-bad-opsec-witness-tampering

President Trump’s former campaign chairman and former lobbyist for dictators Paul Manafort was accused of trying to tamper with witnesses in his own case Monday.

Federal prosecutors working for special counsel Robert Mueller III accused Manafort of attempting to contact witnesses using the encrypted messaging app WhatsApp in an attempt to persuade them to commit perjury, as one of the witnesses put it to the FBI, according to court documents. The evidence obtained by the FBI was a result of Manafort’s awful OPSEC.