James Comey said, in a nutshell, what we ALL know,

friends and foes alike. The President is a LIAR, and it stains those around him, who have to pretend he's not.

Comey went on to say that Trump had a "corrosive"
and "staining" effect on his employees, and the
nation as a whole.

"I think the way in which he acts, especially his
corrosive effect on norms — truth-telling being
the most important of them — has that staining
effect on institutions and people who are close
to them.