WaPo:
The proposed legislation was not a homegrown effort but the product of a network of conservative think tanks pushing similar SNAP restrictions in Kentucky, Kansas, Wisconsin and other states.
...
Iowa ended 2022 with a general-fund budget surplus of $1.91 billion. But at the start of the 2023 legislative session, Republicans made clear that limiting access to SNAP was a priority
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Enacting the bill is expected to cost Iowa more than $17 million in the first three years, far more than the $2.2 million the state spends each year to administer SNAP.
The article discusses the think tank.