Markets tumbled last week during President Trump's whiplash moves on tariffs on Canada and Mexico. More tariffs on steel and aluminum products are set to go into effect on Wednesday, and early next month "reciprocal" tariffs on other nations.

Asked directly if he'd expect a recession this year during an interview that aired on Fox Sunday Morning Futures, Trump declined to rule it out.

"I hate to predict things like that," he said. "There is a period of transition, because what we're doing is very big. We're bringing wealth back to America."

Trump was pressed further on his response during a gaggle with reporters on Air Force One on Sunday evening. "Of course, you hesitate. Who knows? All I know is this, we're going to take in hundreds of billions of dollars in tariffs, and we're going to become so rich you're not going to know when to spend all that money," he said.

President Donald Trump spoke with reporters on Air Force One while traveling back from Palm Beach, Florida, to Washington, D.C. where he defended tariffs -- saying they will be the "greatest thing we've ever done as a country."

"It's going to make our country rich again. We have many companies as you know, auto companies are opening up lands now. We've had four or five announced already, but many more are coming, and we're basically going to take back the money, a lot of the money that we've given away over many decades," Trump said.

The president suggested that tariffs are beneficial for job creation and factory returns to the United States, citing the Taiwan Semiconductor Manufacturing Company's plans to invest $100 billion in new manufacturing plants.

Trump was also asked if he would resume aid to Ukraine if the minerals deal is signed, but he refrained from a definitive answer.

“Well, I think they will sign the minerals deal,” Trump said. “I want them to want peace.”

Trump claimed that Ukraine hasn’t shown that, and it’ll become evident over the next two or three days.

-ABC News' Kelsey Walsh

Health and Human Services employees were offered voluntary buyouts on Friday to resign from their jobs, sources familiar with the matter told ABC News.

Nearly 80,000 federal workers, primarily civilian employees of HHS -- including those from the Centers for Medicare and Medicaid Services, the National Institutes of Health, and the Food and Drug Administration -- received an offer for a "voluntary separation incentive payment" of up to $25,000 with a deadline to respond by March 14.

The offer follows a directive from President Donald Trump's administration that drastically reduced the size of the federal workforce. According to a memo issued by the Office of Personnel Management last month, all federal agencies are set to begin preparations for large-scale layoffs and restructuring by March 13.

-ABC News' Mark Abdelmalek and Kelsey Walsh

President Donald Trump said in an interview aired on Sunday that he expects Ukrainian President Volodymyr Zelenskyy to sign the rare earth minerals deal with the United States.

"Yeah, I think so. I think it'll happen," Trump said in the interview on Fox News' "Sunday Morning Futures" with Maria Bartiromo.

Trump was pressed during the interview on whether he’s comfortable with the United States walking away from supporting Ukraine in its ongoing war with Russia and whether that would hurt Ukraine's chances of survival.

"Well, it may not survive anyway, but you know, we have some weaknesses with Russia," Trump replied.

-ABC News' Kelsey Walsh