President-elect Donald Trump said Tuesday that he is nominating Fox News host and Army veteran Pete Hegseth to serve as his defense secretary.Hegseth, 44, is a co-host of Fox News Channel’s “Fox & Friends Weekend” and has been a contributor with the network since 2014, where he developed a friendship with Trump, who made regular appearances on the show.If confirmed by the Senate, he would inherit the top job during a series of global crises — ranging from Russia’s war in Ukraine and the ongoing attacks in the Middle East by Iranian proxies to the push for a cease-fire between Israel, Hamas and Hezbollah and escalating worries about the growing alliance between Russia and North Korea.Hegseth is also the author of “The War on Warriors: Behind the Betrayal of the Men Who Keep Us Free,” published earlier this year, and has been outspoken about rooting out what he has called …