Tom Bossert, who served as Bush's deputy homeland security adviser, will join Trump's White House as the assistant to the president for homeland security and counterterrorism.

Trump picks former Bush adviser for top counterterrorism job https://t.co/VczMwKmIWs pic.twitter.com/N1S4uqh1H6

— The Hill (@thehill) December 27, 2016

That role will be expanded under the Trump administration, according to a news release announcing the appointment, to give Bossert an "independent status alongside the National Security Advisor."

Bossert will focus on protecting the country from counterterrorism threats, while retired Lt. Gen. Michael Flynn, the incoming national security adviser, will focus on "international security challenges."

"Tom brings enormous depth and breadth of knowledge and experience to protecting the homeland to our senior White House team,” Trump said in the statement.

“He has a handle on the complexity of homeland security, counterterrorism, and cybersecurity challenges. He will be an invaluable asset to our Administration.”