>> reporter: at least 1800 guns
in all.
ak-47s, ammunition, all the fire
power the cartel needed to
continue its slaughter in
mexico.
>> there is no doubt in my mind
that there is accountability
that needs to be held here.
and those that need to be
accountable sit at the top table
for atf.
>> hocez isn't the only one who
wants answers, like who actually
authorized the plan.
this week hearings were held in
congress.
the justice department didn't
have much to say.
iowa senator chuck grassley, the
ranking republican member of the
senate judiciary committee, says
that's unacceptable.
he says it was a decision that
most likely came from
washington, and the highest
levels of american law
enforcement.
>> we think it goes very high up
in the justice department.
but how high, i'm not sure.
>> reporter: right now the
justice department is trying to
keep the investigation focused
on arizona, sending cnn a copy
of the letter to the senate
saying "the operation was