WASHINGTON (AP) -- For six years, President Barack Obama and Israeli Prime Minister Benjamin Netanyahu have been on a collision course over how to halt Iran's nuclear ambitions.
Both leaders see the high-stakes endeavor as a centerpiece of their legacies.
Now, the coming weeks will put the relationship between their countries to one of its toughest tests.
Netanyahu is bound for Washington for an address to Congress aimed squarely at derailing Obama's cherished bid for a diplomatic deal with Tehran. U.S. and international negotiators are trying to reach a framework agreement ahead of a late March deadline.
Netanyahu will speak to members of Congress on Tuesday -- at a time when Secretary of State John Kerry will be in Switzerland, negotiating with the Iranians.