By Tim Reid, Nathan Layne and Gabriella Borter DES MOINES, Iowa (Reuters) – Donald Trump secured a resounding victory in the first 2024 Republican presidential contest in Iowa on Monday, asserting his command over the party despite facing scores of criminal charges as he seeks a rematch with Democratic President Joe Biden. Florida Governor Ron DeSantis, 45, finished well behind in second place, edging out former U.N. Ambassador Nikki Haley, 51, as they battle to emerge as the chief alternative to Trump. Trump, 77, won by an unprecedented margin for an Iowa Republican contest, strengthening his…