If Britain votes to exit the European Union, Washington would lose its key advocate for US interests within the bloc. But some argue that Brexit would strengthen Britain economically, making it a stronger ally.
Donald Trump has spoken against military interventionism and trade deals, putting him at odds with many Republicans. Hillary Clinton, sometimes called 'hawkish,' comes from a pre-Obama tradition that seems to be out of favor in the Democratic Party.
With only one G7 head of state attending, the UN summit underscores how much cheaper it would be if world leaders focused on ending conflicts, especially the war in Syria, rather than trying to deal with the enormous humanitarian crises that result.
The legislation, which still needs the approval of the House and would likely be vetoed by President Obama, has been criticized by Saudi Arabia, which threatened to sell hundreds of billion of dollars of US assets if the measure passed.