US President Donald Trump has appointed Neil Chatterjee to the Federal Energy Regulatory Commission, which oversees electricity, natural gas and oil at the national level.

Former US acting Attorney General Sally Yates said that she had alerted the White House earlier this year that former National Security Adviser Michael Flynn could be "essentially blackmailed by the Russians", the media reported.

The US Forces Korea (USFK) on Tuesday said the Terminal High Altitude Area Defence (THAAD) anti-missile system, which was deployed last week in South Korea, is "operational".

US President Donald Trump will on Tuesday speak over phone with Russian President Vladimir Putin, a White House official said.

US President Donald Trump said on Monday that he was looking at breaking up the huge Wall Street banks, separating their commercial and investment banking businesses.

At least one million babies have been born in the US using in-vitro fertilisation (IVF) and other assisted reproductive technologies, a report has said.

Thousands of people from all over the US marched on Saturday in favour of protecting the environment while slamming the effects that President Donald Trump's policies will have on the climate and on the health of Americans.

Italian authorities on Friday opened an investigation against US online retailing giant Amazon for allegedly evading 130 million euros ($141 million) in taxes between 2011-2015.

North Korea on Saturday launched a ballistic missile that blew up over land, a spokesman for the US Pacific Command said.

US President Donald Trump on Friday told members of the National Rifle Association (NRA), the biggest lobby on behalf of gun ownership in the country, that they have a friend in the White House and promised never to act against the right to bear arms.