President George W. Bush has consistently said "offsets" were required to finance agricultural assistance, Mike Johanns told a Senate Appropriations subcommittee.
Several senators and House members are trying to include $3 billion to $4.5 billion in farm-disaster aid in an Iraq supplemental-spending bill that Congress hopes to pass by April.
Johanns said part of the Agriculture Department's farm bill would help farmers hit by weather adversity.
Notable deaths of 2014 [PHOTOS]
Larry Ellison to step down as CEO of Oracle