National Security Council spokesperson says Trump made no determination to drawdown military presence in Afghanistan
Trump announced he will replace Defense Secretary Jim Mattis with his deputy Patrick Shanahan
Mattis resigned over policy differences with Trump
Ahead of the expected arrival of migrant caravans
US President Donald Trump has said he wants to get to the bottom of the case
Mattis's attempts to carve better relationship with Chinese military in contrast to Trump's anti-Chinese rhetoric
US Defense Secretary Jim Mattis recently visited Kabul
Defense Secretary James Mattis says no decisions are made about major exercises for next year
Continues operations and infrastructure works at Yongbyon nuclear site
Mattis will also meet other top Chinese officials, including president Xi