The additional 1,100 troops would bring the military close to 10,000 total deployed in support of the border mission.
An estimated 9,000 soldiers will participate across more than five states.
The Air Force said it is also preparing to award a contract to convert the Boeing 747-8 into a presidential transport plane.
Sen. Tammy Duckworth blasted the Qatari-gifted plane as a security risk and a waste of taxpayer money.
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