808ikea, please explain what you mean by "from the start."  Trump did not become President until 20 January.  That was the very first day he and his staff could have had access to FBI, CIA and other government documents that might have contained unfavorable information about Flynn.   Flynn's vetting actually was done by the Obama administration when Obama appointed him to head the DIA.  Keaukaha, who liked your comment, claims to have 30 years in government service and might be able to help with your explanation.