chicago u.s. department agriculture say tuesday internal email send staff agricultural research service unit week call suspension public-facing document include news release photos flaw new guidance send replace ars focus scientific research main issue face agriculture include long-term climate change president donald trump cast doubt whether man-made climate change real rail ex-president barack obama efforts combat internal email release without departmental direction prior departmental guidance issue usda say statement ars provide update direction staff say peer-reviewed scientific paper unit block ars value commit maintain free flow information scientists american public original email send jan. 23 say start immediately notice ars release public-facing document include limit news release photos fact sheet news feed social media content usda officials say email send act usda deputy secretary michael l. young send three-page memo usda agency department head key agency officials outline interim procedures staff follow copy interim procedures memo date jan. 23 see reuters show many step reflect either similar measure take previous administration reuters also saw memo date jan. 22 2009 send agency officials former agriculture secretary tom vilsack 2017 memo however differ two main areas centralize agency media inquiries social media presence office secretary part memo ask usda agencies review websites blog post social media consistent direction receive office communication remove reference policy priorities initiatives previous administration also rescind ability usda agencies close office notify local delegations office closure usda disavow gag-order email scientific research unit