She originally joined Fox News in 1998 and then rejoined as an anchor in 2007.
Trump in January took a moment during a press conference that lasted more than an hour, during which he repeatedly lambasted the media, to praise the "very honorable people" at "Fox and Friends", which he called "the most honest morning show".
Nauert is not the first journalist to jump to the role of State Department spokesperson.
Nauert has been a news correspondent since 1998, having spent most of that time with FOX News and briefly for ABC News.
The spot has been vacant since the beginning of Donald Trump's presidency. She also has D.C. experience, working as a government affairs consultant on health insurance, tax and Social Security issues, according to her Fox News bio.
Officials say her media experience and interest in worldwide affairs suits her well to convey the Trump Administration's priorities on foreign policy. It cited her "15 years of experience as an anchor and correspondent covering both foreign and domestic news and events".