Secretary of State Hillary Clinton, a senator and former First Lady, has offered a tough pragmatism on national security matters and called for reviving U.S. credibility in the world.

Sen. John McCain’s Republican presidential campaign has a group of foreign policy advisers reflecting both realist and neoconservative views of the world.

Sen. Barack Obama’s foreign policy team includes former State Department veterans and newcomers from academia who seek to reinvigorate U.S. diplomacy.

The G20 meetings in Toronto will be marked by competing agendas on global growth and financial regulations. This Backgrounder looks at the range of policy concerns.

Sen. Hillary Clinton’s foreign policy team included veteran Clinton administration officials seeking to revive U.S. leadership through a balance of soft and hard power.