US President Donald Trump is holding off on immediate military action against Iran despite a violent crackdown on protests that has killed more than 600 people, as he considers messages from Tehran indicating a willingness to engage in talks.

Trump has repeatedly warned that the use of deadly force against anti-government protesters would cross a red line and has said Iran appears to be nearing it. While the US military has been placed on heightened alert, the White House signaled that Trump is weighing diplomatic options.

White House press secretary Karoline Leavitt said the Iranian government’s private messages differ from its public rhetoric and that Trump wants to “explore” those communications, while remaining prepared to use force if necessary.

Hours later, Trump announced 25% tariffs on countries doing business with Iran, his first concrete punitive step tied to the protest crackdown. The White House did not provide details on how the tariffs would be implemented.

Vice President JD Vance, Secretary of State Marco Rubio and national security officials have been developing options ranging from diplomacy to military strikes, according to a US official. Trump said a meeting with Iranian officials was being arranged but warned action could come sooner.

Analysts say the sustainability of the protests remains uncertain due to internet blackouts and lack of centralized leadership. The demonstrations, triggered by economic collapse, have grown into a broader challenge to Supreme Leader Ayatollah Ali Khamenei’s rule.

Some Trump allies are urging decisive action, arguing Iran is vulnerable after recent conflicts. Iranian officials have warned US or Israeli forces would be legitimate targets if Washington intervenes.