Colleen Shogan loves being surrounded by documents — and that's probably for the best. The former political science professor is now in charge of the 13.5 billion records in the National Archives.

The fast-moving revelations have placed the president under the investigation of a special counsel and ignited Republican criticism. The White House said on Saturday that more documents were found.

Former President Donald Trump is also seeking to prevent the government from further reviewing the documents that were taken until a special master is appointed.

Under federal law, the U.S. government must restrict access to people's records for the once-a-decade tally until 72 years after a count's Census Day. The exact origins of that time span are murky.

They contain memos from meetings with informants, mostly of interest to historians and researchers. No evidence is expected that would put in doubt that Lee Harvey Oswald was the lone gunman.