How exactly would that work? How could the U.S. arrest the leader of a sovereign nation?
And if the U.S. arrested him while he was here for some diplomatic purpose, pretty much everyone in the world would be against us, and it would be as much as a declaration of war.
How did the President of Honduras end up in a US prison and US federal court, standing trial for breaking US federal laws?
https://en.wikipedia.org/wiki/Juan_Orlando_Hern%C3%A1ndez