WASHINGTON -- US President-elect Donald Trump on Tuesday tapped Thomas Bossert as his Assistant for Homeland Security and Counterterrorism, also elevating the role to show his commitment "to the safety and security of the nation."

"He has a handle on the complexity of homeland security, counterterrorism, and cybersecurity challenges. He will be an invaluable asset to our Administration," Trump said of Bossert in a statement online.

Bossert, who has served as the Deputy Homeland Security Advisor to President George W. Bush, will advise Trump on issues related to homeland security, counterterrorism, and cyber security, the statement said.

It added Bossert's role, which was played by Deputy National Security Advisor in previous administrations, has been elevated and will be independent of the National Security Advisor.

Bossert will focus on domestic and transnational security priorities while National Security Advisor Michael Flynn will focus on international security challenges.

The role, performed by a deputy national security advisor in the previous Administration, is being elevated and restored to its independent status alongside the National Security Advisor, a decision that reflects the unwavering commitment Trump has to the safety and security of the Nation, its people and territory.

"I am looking forward to working closely with General Flynn as we together help the President-elect advance the interests of the United States and its allies," Bossert said.