▁from ▁the ▁military ▁in ▁August ▁ 2 0 1 4 . ▁After ▁leaving ▁the ▁military , ▁he ▁established ▁F lyn n ▁Intel ▁Group , ▁which ▁provided ▁intelligence ▁services ▁for ▁business es ▁and ▁govern ments , ▁including ▁ones ▁in ▁Turkey . ▁He ▁became ▁a ▁senior ▁ad visor ▁to ▁Trump ▁during ▁his ▁president ial ▁campaign ▁and ▁served ▁as ▁the ▁National ▁Security ▁Ad visor ▁from ▁January ▁ 2 3 ▁to ▁February ▁ 1 3 , ▁ 2 0 1 7 . ▁He ▁res igned ▁after ▁information ▁sur fac ed ▁that ▁he ▁had ▁mis led ▁the ▁F BI ▁and ▁Vice ▁President ▁Mike ▁P ence ▁about ▁the ▁nature ▁and ▁content ▁of ▁his ▁communic ations ▁with ▁Russian ▁Amb assador ▁to ▁the ▁U . S . ▁Serge y ▁K is ly ak . ▁F lyn n ' s ▁ten ure ▁of ▁just ▁ 2 4 ▁days ▁is ▁the ▁short est ▁in ▁the ▁office ' s ▁history . ▁ ▁On ▁April ▁ 2 7 , ▁ 2 0 1 7 , ▁the ▁Pent agon ▁inspect or ▁general ▁announced ▁an ▁investigation ▁into ▁whether ▁F lyn n ▁had ▁accepted ▁money ▁from ▁foreign ▁govern ments ▁without ▁the ▁required ▁appro val . ▁The ▁New ▁York ▁Times ▁reported ▁on ▁May ▁ 1 8 , ▁ 2 0 1 8 , ▁that ▁a ▁long time ▁F BI / CI A ▁inform ant ▁had ▁met ▁F lyn n ▁at ▁an ▁intelligence ▁sem inar ▁in ▁Britain ▁six ▁months ▁earlier ▁and ▁became ▁al ar med ▁by ▁F lyn n ' s ▁clos eness ▁to ▁a ▁Russian ▁woman ▁there ; ▁this