There is nothing in the FBI guidelines that prevents agents from having or expressing a political opinion in their capacity as an individual, even publicly. Strzok's messages were private — he sent them to another member of Mueller's team, Lisa Page, with whom he was reportedly having an extramarital affair...."
http://thehill.com/policy/national-security/364369-fbi-agent-becomes-gop-public-enemy-no-1
JESUS HEALS!