Many of the Federal resources that were commonly available are no longer viewable online, and permanent URLs in library records may not resolve.
The Internet Archive has copies of many Government documents, sites, and data sets, but they do not have all the public data that had been previously freely available. Visit: https://web.archive.org/ (Internet Archive) if you are looking for a particular resource. The whitehouse.gov site as it appeared during the previous administration has been archived. You can find it here: https://bidenwhitehouse.archives.gov/