In a series of early morning tweets, Trump said he was in no hurry to launch a strike and that US economic sanctions created to force Iran to curb its nuclear and missile programs and its involvement in regional wars were having an effect.
Mr Trump said yesterday he had called off a military strike to retaliate over the downing of the drone because it could have killed 150 people. He addressed reporters as he left the White House on Saturday for a weekend at the Camp David presidential retreat. "In [some] cases we are moving rapidly".
Pentagon spokeswoman Commander Rebecca Rebarich said on Saturday: "We stand by where we said the aircraft was operating in global airspace".
"We want to be proportionate", he said on Saturday, though he did not rule out the possibility of future military action against Iran. June 28, for example, is a crucial date for the U.S. and Iran, albeit for different reasons.
Trump also blasted former United States president Barack Obama's Iran deal to limit Tehran's nuclear capacity.
Khomeini has the last say on all state matters and has ruled out any talks with Washington while Tehran is under sanctions. Iran said the drone was in its airspace, but the USA said it was in worldwide airspace.
The Saturday report by the official IRNA news agency said Iran issued a "strong protest" to the UAE diplomat, saying Iran does not tolerate the facilitation of foreign forces that violate its territory. "We have a tremendously powerful military force in that area".
Teheran has also said it is not seeking a war, but has warned of a "crushing" response if attacked.
According to sources, Mr Trump wants to postpone his response to Iran until after the summit, where he intends to first rally support for his upcoming moves.
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Moreover, a war on Iran would inevitably escalate the United States confrontation with China, which can not cede to USA imperialism a stranglehold over the oil resources of the Middle East that sustain its economy, and which sees Iran as a strategic link in its One Belt, One Road strategy to deepen the integration of Eurasia.
The likely scenario for retaliation will include ramping up sanctions on Iran in parallel with limited "preventive" military steps targeting IRGC bases, and perhaps a nuclear site such as the one in Isfahan. He added that Iran will launch a "historic response" against any attack and ensure the enemy regrets the strike.
"But hopefully they're smart and hopefully they really care for their people and not themselves, and hopefully we can get Iran back on to an economic track that's fantastic, where they're a really wealthy nation, which would be a wonderful thing", he added.
The shootdown of the Global Hawk, following the explosions last week that set two tankers ablaze in the Gulf of Oman, marked the latest escalation in the crisis in the region and raised concerns about how the USA would respond.
The strikes would have been in retaliation to the downing of a USA surveillance drone. -Israeli security ties, said Trump was undermining US credibility.
A second Iranian official said: "We made it clear that the leader is against any talks, but the message will be conveyed to him to make a decision".
A senior Arab diplomat said sharply increased tensions would further harm the crisis-hit Middle East region.
Earlier reports said that U.S. planes and ships had already been mobilized for the strikes.
Now, he has set a timetable for fresh punitive economic measures to heap more pressure on an Iranian economy already reeling from the sanctions in place since Trump withdrew from an worldwide nuclear deal with Tehran.