Getty ImagesPresident-elect Donald Trump is expected to name Rep Michael Waltz, a Florida Republican, to serve as national security adviser, two sources familiar with the matter told CBS News, the BBC’s US partner.A veteran of the war in Afghanistan and a long-time Trump supporter, Waltz was re-elected to Congress last week – though he will have to vacate his office to serve in the White House.In this role, Waltz would serve as a key White House adviser on national security and foreign policy matters. It is a prominent role that does not require confirmation.Senator Marco Rubio of Florida is in talks to be Trump’s nominee for secretary of state, though the pick is not a done deal, two sources told CBS.Waltz and Rubio’s offices did not respond to the BBC’s request for comment.Waltz: a soldier and congressmanA decorated Green Beret and Army veteran, Waltz served multiple tours in Afghanistan, the Middle East and Africa. He drew on his experiences serving in the Pentagon during the George W Bush administration and in combat in his book Warrior Diplomat: A Green Beret’s Battles from Washington to Afghanistan.Waltz’s military experience led to key national security committee assignments when he was elected to Congress in 2018, serving on the Armed Services, Foreign Affairs and Intelligence Committees. The Florida congressman’s expressed views in Congress have hewed closely to Republicans’ political views on national security and foreign policy since Trump’s election in 2016 – but they also acknowledge the US’s key role in global affairs.Waltz has suggested NATO allies increase their defence spending, though he has not gone as far as Trump and said the US should leave the alliance altogether. “Look we can be allies and friends and have tough conversations,” Waltz said last month.He has said the US should maintain its support for Ukraine, but in recent weeks he’s advocated for a reassessment of the US funds sent to aid the country. Waltz has also taken a tough line on China while in Congress, and – as chair of the Armed Services Subcommittee on Readiness – argued that the US needs to do more to prepare for conflict in the Pacific. Since the US’s 2021 withdrawal from Afghanistan, Waltz has frequently criticised President Joe Biden and the White House for its decision to leave the country. Waltz would be the second member of Congress to be tapped to serve in the next Trump administration, which will require him to resign his office in the House of Representatives and potentially slim Republicans’ controlling majority. He would be the fifth national security adviser to serve under Trump, who appointed four different men to serve in the position during his first term. He fired three of them. Michael Flynn, a retired general and Trump loyalist lasted for only 24 days before he was fired. Trump then appointed and later dismissed HR McMaster, another retired general who would later criticise th …