The Democratic and Republican presidential contenders have begun defining their approach to major foreign policy issues as they jockey for position in their parties’ primaries.

The Democratic field could touch on a number of foreign policy issues, from climate change to Iran, during its first prime-time sparring session.

Policymakers face complex cost-benefit considerations when intervening in the market to mitigate perceived risks, from climate change to competition with China.

Israel has long been the leading recipient of U.S. foreign aid, including military support. That aid has come under heightened scrutiny amid Israel’s monthslong war to eliminate Hamas.

The fentanyl epidemic is a major election issue. The U.S. could leverage trade policy with China to crack down on its export.