Investigators are looking into anti-Trump sentiment as being a motive for the attacker who sought to breach the White House Correspondents’ Dinner in Washington DC where the US president and top members of his administration were present.

Officials have said that the shooter likely was targeting Donald Trump and other senior administration officials. “We do believe, based upon just a very preliminary start to understanding what happened, that he was targeting members of the administration,” acting US attorney general Todd Blanche said in a TV interview.

Backing that up is a manifesto reportedly written by the suspect, who has been identified as Cole Tomas Allen, 31, of Torrance, California.…