FILE - In this March 1, 2019, file photo, Democratic presidential candidate Sen. Elizabeth Warren speaks to local residents during an organizing event in Dubuque, Iowa. Warren is everywhere in the first three months of her presidential campaign: 11 states as of Tuesday. But where she's not is at the top of early 2020 polls. (AP Photo/Charlie Neibergall, File)

FILE - In this March 1, 2019, file photo, Democratic presidential candidate Sen. Elizabeth Warren speaks to local residents during an organizing event in Dubuque, Iowa. Warren is everywhere in the first three months of her presidential campaign: 11 states as of Tuesday. But where she's not is at the top of early 2020 polls. (AP Photo/Charlie Neibergall, File)

DES MOINES, Iowa (AP) — Massachusetts Sen. Elizabeth Warren is calling for the breakup of what she says are unfair farming monopolies.

Warren says family farms struggle because “bad decisions in Washington have consistently favored the interests of multinational corporations and big business lobbyists over the interests of family farmers.”

If elected president, the Democratic lawmaker says she’d appoint regulators to review and reverse some mergers among farming corporations. She singled out Bayer-Monsanto as a merger that “should never have been approved.”

Warren also proposes breaking up “vertically-integrated” agribusinesses — those, like Tyson, that control multiple levels of production and processing of a product.

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The policy proposals come just days before Warren will appear at a presidential forum hosted by the Iowa Farmer’s Union.

She also has called for the breakup of mammoth technology firms.