Secret Service Columbia Scandal: Director Mark J. Sullivan -- One BIG Question Remains ...

With the Secret Service in full crisis mode following the hooker scandal in Colombia ... there's one question throbbing in the minds of the American people ... and this morning in D.C. that question was asked to the Agency's top dog, Mark J. Sullivan.

Sullivan has been under fire ever since it was reported that 11 of his agents brought prostitutes back to their hotel rooms while in Colombia last week.

According to reports, the only reason the story got out in the first place is because one of the agents refused to pay his prostitute ... so she went to the police to complain ... and it snowballed from there.