(FOXNEWS) — First lady Michelle Obama on Tuesday made a rare foray into a Capitol Hill dispute, using a White House event to rally support for school meal nutrition rules that Republicans are pushing to loosen.

The first lady successfully lobbied for those standards in 2010, and has since become the public face of this and other initiatives aimed at improving the dietary habits of children.

But some schools have complained the rules are too restrictive and costly — and House Republicans have a new bill aimed at addressing those concerns. An agriculture spending bill approved by a House subcommittee last week would allow schools to waive the standards if they have a net loss on school food programs for a six-month period.

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