Multiple countries are offering assistance but not on the scale that the White House wants.

The threat comes as Marines sail toward the region amid widespread speculation that U.S. soldiers could be called on to deploy.

President Donald Trump made it clear he doesn't plan to call a ceasefire with Iran. Connor Ling. More Videos

Dana Bash presses US Ambassador to the United Nations Mike Waltz on President Trump’s decision to remove sanctions on 140 million barrels of Iranian oil.

Tehran sees an opportunity to control the Middle East’s energy as it bets on outlasting Trump’s will—a risky gamble.

The U.S. Treasury has authorized the purchase of Iranian oil that's already at sea, exempting buyers from the tight sanctions that have restricted Iran's oil industry for years, as the Trump administration grapples with high oil prices.

President Donald Trump said he was considering “winding down” US military efforts against Iran, saying that the US was close to achieving its objectives as the conflict, which has roiled financial markets and the region,

Three weeks into an escalating war in the Middle East, Iran threatened to expand its retaliatory attacks to include recreational and tourist sites worldwide, as the U.S. announced it was sending more warships and Marines to the region.