DES MOINES, Iowa (AP) -- Sen. Charles Grassley is asking Agriculture Secretary Tom Vilsack to clear up questions about whether USDA employees at two Iowa egg farms involved in a recall of salmonella-tainted eggs received complaints from farm employees about conditions at the operations.

Grassley sent a letter to Vilsack on Tuesday asking if the USDA received complaints and what was done to investigate the concerns. He also asked Vilsack to answer whether there is a system in place for farm and USDA employees to report concerns.

USDA spokesman Caleb Weaver says the agency is working on a response to Grassley.

Two former workers at Wright County Egg last week claimed their complaints to USDA employees were ignored.

Weaver says the USDA employee at the farm didn't recall any concerns being raised.

Copyright 2010 The AP.

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