Washington - America second.That's a rare consideration for President Donald Trump, who has boasted of a new foreign policy formed around the idea of strength and unabashedly putting his nation's interests first. But his No. 2 billing will be the tradition he must respect when leaders deliver their messages to the world at the UN General Assembly on Tuesday. Historically, Brazil kicks off each assembly and the United States then follows.With rare exception, Brazil has opened the annual gathering for more than six decades.Anticipation for Tuesday's set of speeches is high. Trump will be making his debut at the annual ministerial meeting of the UN's 193 member nations, hoping to sell a vision of international cooperation defined less by collective obligation and more by sovereign states taking voluntary initiatives.