Afghanistan, April 21 -- U.S. President Donald Trump said Iran will negotiate or face serious consequences, stressing any deal must ensure Tehran never develops nuclear weapons.

Donald Trump warned that Iran would face consequences "it has never seen before" if it refuses to negotiate with the United States.

"If Iran does not negotiate, it will face problems it has never encountered," Trump said in a media interview, signalling a tougher stance as tensions escalate.

His comments come amid a deepening standoff between Washington and Tehran, with diplomacy showing little progress.

Earlier, Mohammad Bagher Ghalibaf accused Trump of trying to turn negotiations into "surrender talks" through a naval blockade and alleged ceasefire violations....