Pete Hegseth faced an important test on Tuesday — but he didn't just have to prove himself to the senators who immediately began sparring over his nomination as defense secretary.

Donald Trump’s cabinet picks are beginning their nomination process this week, starting with Trump’s choice for defense secretary, Pete Hegseth

President-elect Donald Trump’s choice for defense secretary is Pete Hegseth calling himself a change agent as a potentially explosive Senate confirmation hearing opens

A new USA TODAY/Suffolk University found a little more than half of Americans don't support Donald Trump's proposal to take over Greenland.

Múte Egede, Greenland’s prime minister, said his country would pursue closer defense and business ties to U.S.

President-elect Trump's talk of Canada as a "51st state" and annexing Greenland registered among national-security crowds as an "Oh, boy!" moment. Obnoxious, enticing, familiar. Why it matters: The darlings of Trump's current foreign policy fixation boast Arctic utility at a time when the icy region is heating up.

A new study found that dementia cases in the United States are projected to double from more than 500,000 in 2020 to about 1 million by 2050.

Dementia cases in the U.S. are expected to double by 2060, with an estimated one million people diagnosed per year, according to a new study led by Johns Hopkins University and other institutions.

A new study found an increased risk of dementia in older Americans, with the risk among Black Americans even greater. NBC News' Anne Thompson reports on what doctors say can help lower the risk of dementia.