"Attorney General Jeff Sessions failed to disclose meetings with Russian officials when he applied for security clearance because he was told not to do so by advisers and the F.B.I., a Justice Department spokesman said Wednesday." -NYT
One fills the form out in its entirety. No ifs, ands or buts. The form is designed that way for truthfulness. Anything other than 100% completion should be grounds for dismissal. I don't care if your mother was standing behind you telling you otherwise. The instructions are clear.
“In the Bush Administration someone who lied on a security clearance form would have been out the door within 24 hrs,” Richard W. Painter, a law professor at the University of Minnesota and the chief White House ethics lawyer for George W. Bush, said on Twitter." -HuPo