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That is not actually true. jim acosta was at the briefing today and he joins us now. it seems like we still don't have a time line from the white house. >> reporter: they are not giving straight answers at these briefings and we saw that again today. you heard sarah sanders that we warrant aware of the extent of what porter was accused of until s tuesday night. anderson, we have known for months, or we know they knew for months that this was lurking in rob porter's background that he was having background check problems in the security check problems and until the white house acknowledges that...

Else, supports victims. based on what he says and tweeted, to barrow sarah sanders much-used phrase, that's not exactly true. jim acosta joins us now. we don't have a timeline from the white house as to who knew what and when. >> no, anderson. the white house is extending the timeline of the scandal because they're not giving straight answers at the briefings. you heard sarah sanders say while they weren't aware of the extent of what rob porter was accused of until last tuesday night, of course, we know for a fact, never mind that the deputy spokesman said they're fully aware in that general a...

>> r eporter: there are a thousand government workers who hold the same job as nsa leaker ed snowden, a systems administrator who had sweeping access to highly classified sites. while we don't know whether there were background check problems in snowden's case, based on this testimony just as one example of fraud, a background investigator fabricated 1600 credit checks, and it turned out her own background investigation for that job was falsified. martha. martha: wow, that is incredible. what are we learning, catherine, about these plots that were disrupted by the nsa? >> reporter: there's gro...

>> r eporter: on tuesday the head of the nsa testified that there are at least a thousand government employees like nsa leaker edward snowden who have broad access to the networks containing these highly classified documents. >> how many people were in the same position as snowden was as a systems manager to have access to this information that could be damaging if released? >> there is on the order of a thousand system administrators. the majority are contractors. >> reporter: we don't know this morning whether there were any background check problems with snowden's security clearance, though...