Force them to answer by filibuster.
Red line, cancel, all of Homeland Security's budget until they provide a detailed, verifiable, explanation of their expenditures, present and future.
Also inform other Federal agencies that if they transfer funds to Homeland Security that their budgets for the following years will also be red lined.
After all we are in the middle of a financial crises that the likes haven't been seen since the Great Depression of the 1930’s, aren't we?
Oh, excuse me, that would make the Republicans stand up and do something other than cooperating with the dimocrats.
Last thought - any more questions as to why the Senate hasn't had a budget for the last four years?