'Provocation': US Navy Ship Criticised After Sailing Through South China Sea
It comes as the United States and China begin trade talks.
It comes as the United States and China begin trade talks.
President Trump previously announced all 2,000 US troops were to be withdrawn from the country.
Rear Admiral Kevin Sweeney becomes third senior Pentagon official to resign in recent weeks.
The former US Marine, who is a dual US and British citizen, was detained a week ago.
Dr Julian Lewis MP has said it is "fanciful" to believe British forces could stay in Afghanistan if the US leaves.
Jeremy Hunt said Paul Whelan was being given "every support that we can" after it emerged that he also has British nationality.
Trump has said any withdrawal would happen "slowly" after officials said US troops would be home from Syria in 30 days.
The Russian Federal Security Service said Paul Whelan was caught "during an espionage operation", but gave no details.
Patrick Shanahan was the former Deputy Secretary of Defense.
Talks between the US and North Korea over denuclearisation have stalled in recent months.
US Strategic Command tweeted a video clip showing an aircraft dropping bombs and explosions.
Senior Republican says President Trump committed to defeating IS in Syria
During his first visit to the region, Mr Trump also said he has no plans to withdraw US forces from Iraq.
"Personal lift devices are making a comeback", writes technology expert David Hambling.
Trump has forced Defense Secretary Jim Mattis out of his role two months early, by announcing his successor will start next week.
It has been suggested Jim Mattis quit because of a pull-out of US troops from Syria and a reported planned withdrawal from Afghanistan.