US President-elect Donald Trump said that he had chosen celebrity doctor Mehmet Oz to serve as administrator for the Centers for Medicare and Medicaid Services.
Dr Oz presented 'The Dr Oz Show', a health and wellbeing talk show on TV between 2009 and 2022.
In 2022, he unsuccessfully ran for the US Senate.
Mr Trump, who endorsed Dr Oz in that race, said he would work closely with Robert F Kennedy Jr, who has been nominated to lead the Department of Health and Human Services.
Mr Trump said the pair would take on "the illness industrial complex, and all the horrible chronic diseases left in its wake" as well as cutting what he called waste and fraud.
"Our broken Healthcare System harms everyday Americans, and crushes our Country's budget," Mr Trump said in a statement.
The agency runs Medicare, the federal health insurance programme for people aged 65 or older and the disabled. The office also oversees Medicaid, the state-based health insurance programme for low-income people, which is jointly funded by states and the federal government.
Collectively, they provide health insurance for over 140 million Americans.
Mr Trump promised during his campaign not to cut Medicare, but is expected to let federal subsidies for Medicaid expire at the end of 2025.
The Centers for Medicare and Medicaid Services also handles enrollment in health insurance marketplaces under the Affordable Care Act, also known as Obamacare.
Mr Trump and other Republicans have previously tried to repeal the law but now say they only seek to overhaul it.
Dr Oz was a regular Fox News commentator during the Covid-19 pandemic and a proponent of unproven treatments for Covid-19 including hydroxychloroquine, an anti-malaria drug whose use against the disease was also backed by Mr Trump.
He challenged the Biden administration's Covid-19 pandemic policies on social media, including mask policies, saying they ignored the science and were based on missing data.
Fox broadcasters feature in Trump plan
Dr Oz is the latest in a line of television personalities to be picked by Mr Trump to join his new administration.
Mr Trump nominated former congressman Sean Duffy to be transportation secretary and oversee a huge federal portfolio of infrastructure spending and transit regulations.
Mr Duffy - like defence secretary pick Pete Hegseth - is a Fox television host, with the former on Fox Business and the latter on the arch-conservative Fox News.
As the incoming Republican administration promises a swathe of spending cuts, Mr Trump praised Mr Duffy's advocacy in congress for "fiscal responsibility".
Still, with the leader of the Department of Transportation tasked with overseeing major infrastructure upgrades and maintenance, the president-elect said Mr Duffy, from Wisconsin, worked with Democratic colleagues in Congress on a major road and bridge project.
And as the Trump administration seeks to slash regulations, the incoming president said Mr Duffy would eliminate racial diversity programmes for pilots and air traffic controllers.
"He will prioritise excellence, competence, competitiveness and beauty when rebuilding America's highways, tunnels, bridges and airports," Mr Trump said.
Trump not reconsidering AG nomination
As Mr Trump rounds out his picks for his cabinet - which will help him attempt to carry out an agenda of trade tariffs and mass deportations - he has tapped a mix of political allies, firebrands and a few relatively conventional figures, with loyalty to Mr Trump, which he values most.
The Republican-led Senate will need to approve his nominees, and Mr Trump is already facing pushback from his own party on some.
Mr Trump said he was not reconsidering the nomination of former Congressman Matt Gaetz as attorney general.
Mr Gaetz, 42, who was investigated by the Justice Departmentfor nearly three years over sex trafficking allegations involving a 17-year-old girl, was tapped by Mr Trump to run the agency when he returns to the White House in January.
Mr Trump, asked if he was reconsidering the nomination, replied "No."
He was speaking in Texas after the launch of a rocket by Elon Musk's SpaceX.
Mr Trump did not respond when asked how far he was willing to go to get Gaetz confirmed.
The nomination generated some scepticism given that the former congressman, first elected in 2016, was under investigation by the House of Representatives' Ethics Committee.
He resigned from Congress hours after he was nominated for attorney general.
Some Republicans in the Senate have called the committee to turn over its findings on allegations of sexual misconduct involving a teenager and drug use by Mr Gaetz.
Republican House Speak Mike Johnson has said the committee should not release its report.
Mr Hegseth, who would lead the Pentagon, is under scrutiny after it was revealed he paid a settlement to a woman who accused him of sexual assault, as part of a non-disclosure agreement.
