Stock Markets March 18, 2026

Trump Urges Allies to Take Over Strait of Hormuz Security, Markets Respond

President's Truth Social post questions U.S. responsibility for keeping the vital shipping lane open as energy and equity markets react

By Jordan Park
Trump Urges Allies to Take Over Strait of Hormuz Security, Markets Respond

President Trump criticized the United States' sole responsibility for safeguarding the Strait of Hormuz and suggested allied nations should assume the role, posting his remarks on Truth Social. S&P 500 futures were up 0.3% while crude oil prices were slightly lower; both markets responded to the post. The European Union said it would not rush to provide the military assistance Trump has repeatedly requested. Shipping through the strait has nearly halted amid a war involving the U.S., Israel and Iran, with retaliatory strikes reducing traffic and pushing energy prices higher.

Key Points

  • President Trump publicly questioned U.S. responsibility for keeping the Strait of Hormuz open and urged allied nations to assume that role.
  • S&P 500 futures rose 0.3% and crude oil prices were slightly lower on Wednesday morning; both markets reacted to the president's Truth Social post.
  • The European Union, a 27-nation bloc including close U.S. allies, said it would not be rushing to provide military assistance to reopen the strait.

President Trump took to Truth Social Wednesday morning to express frustration that the United States appears to be carrying the primary burden for keeping the Strait of Hormuz open, urging other nations to assume responsibility for the shipping lane's security.

In a post on the platform, Trump wrote: "I wonder what would happen if we ’finished off’ what’s left of the Iranian Terror State, and let the Countries that use it, we don’t, be responsible for the so called ’Straight?’ That would get some of our non-responsive ’Allies’ in gear, and fast."

Markets registered a reaction to the post. S&P 500 futures remained up 0.3% following the comments, while crude prices were slightly lower Wednesday morning - both markets were influenced by the Truth Social message.

European officials made their position clear on Tuesday when the European Union said it would not be racing to meet calls for military assistance to reopen the Strait of Hormuz. The EU is a 27-nation bloc that includes several of the United States' closest allies.

Commercial traffic through the strait has almost come to a standstill amid an ongoing conflict the article describes as a war launched by the U.S. and Israel against Iran. Tehran's retaliatory missile and drone strikes across the Persian Gulf have been cited as the reason for the sharp reduction in shipping activity.

The strait normally handles a significant portion of global oil flows - roughly a fifth of all crude oil supplies typically pass through the waterway - and the disruption has contributed to a pronounced rise in energy prices.

Trump has repeatedly called on European allies to deploy warships to protect commercial vessels transiting the strait. According to the account provided, allied governments were excluded from the planning that preceded the assault on Iran.

The sequence of events in recent days - the president's public admonishment, the EU's reluctance to send forces, the near-halt in shipping, and the market moves in equities and crude - underscore the close link between geopolitical developments in the Persian Gulf and short-term market dynamics.


Contextual note: The information above reflects the statements and market reactions reported on Wednesday morning and attributes strategic decisions and military actions as presented in the original account.

Risks

  • Disruption to shipping through the Strait of Hormuz - the strait handles roughly a fifth of global crude oil flows - poses risk to the energy sector and broader markets via higher oil prices.
  • A lack of coordinated allied military response could prolong commercial shipping disruptions, creating continued volatility in energy and transportation sectors.
  • Public calls for allied intervention and reports that allies were excluded from planning ahead of the assault on Iran add uncertainty to diplomatic and security cooperation, with potential market implications for defense and maritime industries.

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