President-elect Donald Trump announced Tuesday that heart surgeon-turned-TV-host Dr. Mehmet Oz would lead the Centers for Medicare & Medicaid Services (CMS).

So is he a real doctor? What would he be in charge of in the role? And what are some of his past controversies?

Read more here about what to know about Oz, his medical career and some medical claims he's made that have come under fire.

Lara Trump, Republican National Committee co-chair and daughter-in-law of President-elect Trump, said Wednesday morning on Fox and Friends First that she would "absolutely" accept an appointment to the U.S. Senate to replace Sen. Marco Rubio Florida Gov. Ron DeSantis chooses her.

DeSantis will need to appoint someone to replace Rubio, who has been nominated to be Trump's secretary of state. Rubio has not resigned from the Senate yet and like all Cabinet picks, is not confirmed yet -- although his confirmation process is expected to go smoothly.

"I would be honored ... to serve as the next senator from my state -- right now, I've lived here for three and a half years -- of Florida. Absolutely," Lara Trump said.

Later, she added that DeSantis would "choose the best person for this position."

"If he asks me to do it, yes, absolutely. It would be an honor," she said.

-Oren Oppenheim

Stephen Miller, President-elect Donald Trump's deputy chief of staff of policy, joined Hannity on Tuesday evening where he discussed a wide range of topics including several of Trump's day one missions -- including recess appointments to his Cabinet.

Asked if some Cabinet appointments were to become troublesome if Trump would use the recess appointment process, Miller said he would.

"Yes, the president has won a mandate, and he will use all lawful constitutional means to fulfill that mandate on behalf of the people who voted for him in record numbers," Miller said.

Indicating that immigration will be a priority, Miller said mass deportations will occur immediately.

"It is going to be at light speed," Miller said. "The moment that President Trump puts his hand on that Bible and takes the oath of office, as he has said, the occupation ends, liberation day begins."

Miller added that Trump will "immediately sign executive orders sealing the border shut, beginning the largest deportation operation in American history, finding the criminal gangs, rapists, drug dealers and monsters that have murdered our citizens and sending them home."

-Kelsey Walsh, Lalee Ibssa, Soorin Kim

Karoline Leavitt gave her first interview since being chosen as President-elect Donald Trump's press secretary last week.

Asked if there would be daily press briefings during her appearance on Fox News, Leavitt punted to Trump.

"It's certainly something I'll discuss with President Trump. Ultimately, he is the decision-maker, as you know, that was the way in his first White House. It was the way on our campaign, and I will defer to him," Leavitt said.

She didn't address whether they'd knock traditional media aside for right-side broadcasters or podcasters, as some news outlets have indicated.

"We hope there will be decorum, certainly, and we will try to instill that. But we're not shy of the hostile media," she said. "We've dealt with that now in the campaign for the last year. Nobody does it better than President Trump."

Explaining that the most effective communication methods might include "bringing different voices into the press briefing room" and vaguely stating that it might also "include some different rules," she added: "Ultimately, it's about serving the American people and getting President Trump's message across to them."

-ABC News' Lalee Ibssa, Soo Rin Kim and Kelsey Walsh