There is no way to veto that $7 billion. There is no line-item veto. There is also no way to get senators to go along unless you buy them off - you may remember it from your civics classes as "log-rolling."
(If the pork is only $7 billion - or less than 1% of the bill - it would be miraculous. It is probably 10 times that.)
Thus it has always has been; thus it will always be.