The tweets marked Trump's first public comments about the deaths of the children.
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More than 2,400 American soldiers have died in Afghanistan since the 2001 USA -led invasion, and Trump announced in a video last week that troop deaths were on his mind in announcing the pullouts.
The U.S. president also took a swipe at the North American Free Trade Agreement (which the U.S., Mexico, and Canada agreed to replace in early October) and said the U.S. would be cutting off aid to Honduras, Guatemala, and El Salvador, claiming without evidence that another caravan of immigrants is on its way north.
Some people posted old Trump tweets they thought were more relevant to the conversation. "If we had a Wall, they wouldn't even try!"
Markets Right Now: US stocks open lower as sellers return
Investors have been unnerved by the potential for weaker economic growth and a partial USA federal government shutdown . Technology companies, a big driver of the market's gains before the October downturn, slumped Thursday.
Trump's statements - the first in which he has addressed the children's deaths - came on the second day of Homeland Security Secretary Kirstjen Nielsen's tour of border communities throughout the southwest USA following Gomez Alonzo's death earlier this week, which she has called "deeply concerning and heartbreaking".
With her agency facing increasing criticism over the treatment of migrants, Homeland Security Secretary Kristjen Nielsen announced the new medical screenings for immigrant children and she embarked Friday on a two-day tour of border facilities in Texas and New Mexico. Instead, the little boy vomited and spiked a fever; he died at a New Mexico hospital.
United Kingdom defence secretary concerned about Huawei's role in 5G networks upgrade
It would cost $800 million to $1 billion for all RWA members to replace their Huawei and ZTE equipment, Bennet said. President Donald Trump may be ready to sign a new executive order.