I am in sync with Colin Powell on this one.
In the Powell leaked emails, we have one from Powell to his son Michael, where he calls Retired General Michael Flynn a "right-wing nutty" in a July 19, 2016. Powell went on to write, "Real question is how he got that far in the Army."
"Gen. Flynn is a jerk. Got canned out of DIA," Powell wrote in another email.
My takes on Flynn are here.