WASHINGTON (AP) — President Barack Obama will ask Congress to quickly authorize the arming and training of Syrian opposition forces but will press forward without formal sign-off from lawmakers on a broader military and political effort to combat militants in Syria and Iraq, administration officials said Tuesday.

Obama was to outline his plans Wednesday in a rare prime-time address to the nation, a format that underscores the seriousness of the threat posed by the Islamic State militants. The president’s broader strategy could include more wide-ranging airstrikes against targets in Iraq and possibly in Syria, and hinges on military and political commitments from allies in Europe, the Middle East and elsewhere.