As active-duty U.S. soldiers began moving toward the nation's southern border to confront what President Donald Trump called "a national emergency," much is still unclear about their mission, including whether they would be armed,

Donald Trump is to send 10,000 troops to the US’s southern border to help repel an “invasion” of migrants attempting to cross from Mexico, according to a report.

The 1,500 active duty troops Trump deployed to the southern border began arriving Thursday. Four C-17 and C-130 military aircraft moved to El Paso and San Diego to carry out deportation flights.