shootings, one of the sources of the problems. >> reporter: more than 50 regulations are vulnerable, from the healthy hunger-free kids act that sets nutrition standards for school lunches, to a regulation intended to increase access to treatment for opioid use. they're moves that have right-leaning advocacy groups applauding. >> the stars really have aligned. we have a republican congress, republican president, and an outgoing democratic administration. >> well, in the past, lawmakers have attempted to use the congressional review act some 72,000 times, but they have only been successful once. so when congress uses it five times in just one week, that's what we mean when we say it truly is unprecedented. but there's a limit to this. they only have 60 legislative days to go about rolling back regulations in this way. >> 60 legislative days spreads out -- >> until about june. >> because they take so much recess, so that's a while that they've got this opportunity to do this. good report. rene marsh reporting for us.