US President Donald Trump has vowed to delay a planned tariff increase on Chinese exports after both sides hailed "substantial progress" in trade talks, raising the prospect of a summit with President Xi Jinping to seal the deal.

As the partial US government shutdown hit the four-week mark on Friday, tensions mounted in Washington on either side of the standoff over President Donald Trump's demand for $5.7 billion to help fund a US-Mexico border wall.

US President Donald Trump has described Qatar as a great place and Al Udeid Air Force Base an incredible base.

US President Donald Trump pointed Wednesday to the mass shooting at a Christmas market in France to bolster his demands for funding to build a US border wall with Mexico.

US resident Donald Trump on Monday said he would discuss military developments with his counterparts from China and Russia in the future, in the hopes of ending what he described as an arms race with the countries.

Turkish President Recep Tayyip Erdogan and his US counterpart Donald Trump agreed Friday that no cover up of journalist Jamal Khashoggi's murder should be allowed, a Turkish presidential source said after a phone call between the two leaders.

Donald Trump ratcheted up pressure on Beijing as the new round of levies will bring the amount of goods hit by duties to roughly half of Chinese exports to the US.

Paul Manafort also pleaded guilty to two criminal counts, becoming the most prominent former Trump campaign official to plead guilty in Mueller's investigation.

Donald Trump has previously criticised the WTO's dispute settlement system as being unfavourable to the US.

Days after canceling a planned visit to North Korea by his top diplomat citing insufficient progress in denuclearization talks, US President Donald Trump hailed his personal relationship North Korean leader Kim Jong Un on Wednesday and said there was no reason to resume war games with South Korea.

The 41 blocked users include a film producer, screenwriter, photographer and author who had criticised President Trump or his policies.

US President Donald Trump abruptly canceled his top diplomat's planned trip to North Korea on Friday, publicly acknowledging for the first time that his effort to get Pyongyang to denuclearize had stalled since his summit with the North's leader.