A top Republican campaigning for immigration reform is warning that America needs at least 1 million more immigrants every year just for basic farming and construction jobs, not ban like some in the party are advocating.

Carlos Gutierrez, Commerce secretary under former President George W. Bush, said that without more immigrants, businesses won’t be able to grow because there aren’t enough workers available. And helping them could boost the Republican Party, added the former Kellogg Co. executive.