Canada’s spy agency has since been directed to immediately pass on information about threats to members of parliament and their families.
“China strongly condemns and firmly opposes this and has lodged serious démarches and strong protest to Canada,” China’s Ministry of Foreign Affairs said in a statement on Tuesday.
China last week accused Canada of “slander and defamation” over the claims Beijing targeted Mr Chong and his family.
Mr Chong, a Conservative, has criticised the governing Liberals of mishandling the matter and on Monday said: “It shouldn’t have taken two years for the government to make this decision”.
The allegations come amid other intelligence reports, leaked to Canadian media outlets, that have accused China of attempting to interfere in Canadian elections.
In March, Canadian Prime Minister Justin Trudeau announced an independent special rapporteur to investigate the interference claims.
