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Hopes of a quick ceasefire between Israel and Iran were dashed by several social media posts from U.S. President Donald Trump. As he took an early departure from the Group of Seven summit, Trump said it “certainly has nothing to do with a Cease Fire” and that he was involved in something “much bigger than that.”

What’s bigger than a ceasefire? An escalation in conflict on the prospect of the U.S. joining the hostilities in the Middle East. Trump, on his social media platform Truth Social, threatened Iran’s leader Ayatollah Ali Khamenei that he is an “easy target” and wants him to “surrender.”

Trump’s posts on Truth Social brought U.S. stocks lower and caused oil prices, which were on the retreat Monday, to shoot up more than 4% during Tuesday’s trading session in America. A weaker-than-expected U.S. retail sales report in May also added to the heavy sentiment in markets.