By Nathan Layne DES MOINES, Iowa (Reuters) -Donald Trump said on Wednesday that he knows who he wants for his running mate in the 2024 race for president and that his commitment to the NATO alliance will depend on how Europeans treat the United States. The frontrunner for the Republican nomination, Trump was asked by anchors at a live Fox News town hall who was under consideration for vice president on his ticket. “I can’t tell you that really. I mean I know who it’s going to be,” Trump told the gathering of Republican voters in Des Moines, Iowa, five days before that Midwestern state’s first-…