US President Donald Trump on Sunday strongly rejected allegations contained in a manifesto written by the suspect of the White House Correspondents' Dinner shooting, labelling the attacker a "sick person" and distancing himself from claims linking his administration to the Jeffrey Epstein files.

The shooting, which occurred during one of Washington's most high-profile social events, saw a 31-year-old suspect, identified as Cole Tomas Allen, attempt to breach security and open fire before being neutralised by the United States Secret Service.