The White news House said on Thursday that it will ban staffers and guests on using personal cellphones in the West Wing.

One of US President Donald Trump's top aides, Deputy Chief of Staff Rick Dearborn, will step down early next year to pursue private sector work, White House officials said.

White House Homeland Security Adviser Tom Bossert has said that the US believes North Korea was behind the massive "WannaCry" cyberattack in May, the media reported.

Washington D.C. police on Monday said that they found at least nine weapons including assault-style weapons in a former police officer's car after stopping him for urinating near the White House.

Kim also accused Trump of uttering "unprecedented rude nonsense that one has never heard from any of his predecessors," saying the threat to "totally destroy" a sovereign state has gone beyond the limit.

"That shadow has been cast over some of our best and brightest young people once again. To target these young people is wrong...and it is cruel," said Obama.

Fifty six per cent of Americans have said that they believed President Donald Trump was "tearing the country apart" instead of drawing people together, according to a new poll.

US President Donald Trump held a second, previously undisclosed meeting with Russia's Vladimir Putin on July 7 during the G-20 summit in Hamburg, the White House said on Tuesday.

The White House announced that it has hired attorney Ty Cobb who will serve as a special counsel to manage matters related to an ongoing probe into Russia's alleged interference in the 2016 presidential election, the media reported.

US President Donald Trump has nominated Krishna R. Urs to be the ambassador to Peru, the White House announced on Wednesday.