China would prefer that Donald Trump is not re-elected in the us presidential election of 3 November, and has "increased its efforts to influence" upstream of the ballot, has estimated Friday that the us intelligence services.

Iran is also trying " to weaken the president Trump ", while Russia uses "multiple levers especially to denigrate" his rival, democrat Joe Biden, according to William Evanina, director of the national Centre of counter-intelligence and Security (NCSC).