WASHINGTON — US President Donald Trump threatened Iran in a tweet on Sunday, raising concerns about a potential US-Iran conflict at a time when tensions between Washington and Tehran have risen.

“If Iran wants to fight, that will be the official end of Iran. Never threaten the United States again,” Trump said in a tweet.

Trump has tightened economic sanctions against Iran, and his administration says it has built up the US military presence in the region. It accuses Iran of threats to US troops and interests.

Meanwhile, Trump’s strong Republican ally, Senator Lindsey Graham, launched a broadside against Iran in a tweet, saying Iran is causing this crisis – not the Trump Administration.

“While no one wants a war, it must be clear to Iran that aggression against American interests will be met with overwhelming force and the conflict will end on America’s terms.” — Agencies