Who exactly is Pete Hegseth, the Pentagon chief facing an impeachment bid?

US Defence Secretary Pete Hegseth on Tuesday dismissed the impeachment effort against him as "a political spectacle". He made the comments a day after Republican Thomas Massie launched a bid to impeach him over his handling of the unpopular war in Iran and other actions. But who is Pete Hegseth? A former Fox News host and military veteran, he has become one of the most prominent figures in the Trump administration.