Rex Tillerson appears to have found out via Twitter that the US president had removed him from his role.

Trump sacks Tillerson as secretary of state

Rex Tillerson's comments are the strongest US response yet to Mrs May's declaration it was "highly likely" Russia was behind the attack.

Trump and Tillerson at odds over nerve agent attack

US-North Korea talks would need a "sustained cessation" of missile tests, Tillerson said.

Secretary of State Rex Tillerson says that 'lines of communications' are in use with Pyongyang during China visit.

North Korea is running the risk of a "major, major conflict" with the United States, Donald Trump has warned.

The US president's comments echo those of his Secretary of State who received a frosty reception during talks in Moscow.

“My wife told me I’m supposed to do this," the 65-year-old Texan explained

The development comes as US Secretary of State Rex Tillerson visits the country's main ally, China.

The former Exxon Mobil CEO is an unconventional pick for secretary of state but took a firm line on Russia at his confirmation hearing.

So now it's official. An oilman is to become America's top diplomat. It's another stunning example of Trump turning Washington upside down.