Transcript for First Lady Fights to Change School Lunch Programs
American officials are skeptic skeptical. They cannot verify the claim. An unlikely glad Yater entered the arena today. First lady Michelle Obama came out swinging today about an issue close to her heart and Jonathan Karl tells us about her direct challenge. Reporter: A rare sight. The first lady into the fray. This is unacceptable. It's unacceptable to me. Not just as the first lady, but as a mother. Reporter: Mrs. Obama is digging in defending federal standards that transform the old school lunch of cheese pizza and tater tots into lunches like this. Wh),:át(u paghetti, green beans, broccoli, cauliflower and kiwi fruit. She helped push the standards through. And now republicans want to roll them back. The last thing that we can afford to do right now is play politics with our kids' health. Especially when we're finally starting to see some progress on this issue. Reporter: The first republican response cam on Twitter. Reporter: But the San Diego school district which ditched junk food long ago says it is the only way to get kids to eat healthy. The republican bill would allow schools to opt out. But they will have to fight the first lady to do that. As for the complaint about food getting thrown out, the first lady says that's not happening so much anymore because the healthy menus are beginning to catch on. Diane.
This transcript has been automatically generated and may not be 100% accurate.