President Donald Trump says the world will know "probably in the next 10 days" whether the US will make a deal with Iran or take military action.
At the first meeting of his Board of Peace in Washington, DC, Trump said of negotiations with the Islamic Republic over its nuclear program: "We have to make a good deal or bad things will happen."
In recent days, the US has increased military forces in the Middle East, while progress has been reported in talks between US and Iranian negotiators in Switzerland.
Democratic lawmakers and some Republicans have opposed any potential military action in Iran without congressional approval.
In his speech, Trump said that Special Envoy Steve Witkoff and Jared Kushner, who is also Trump's son-in-law, had "some very good meetings" with Iran.
He said, "The last few years have proven that it's not easy to make a good deal with Iran." "Otherwise, bad things will happen."
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A day earlier, White House Press Secretary Caroline Levitt warned that it would be "very wise" for Iran to strike a deal with the US, and said Trump still hoped for a diplomatic solution to Tehran's nuclear program.
When Trump first announced the Board of Peace, it was believed to be aimed at ending the two-year war between Israel and Hamas in Gaza and overseeing reconstruction.
But last month, its mission appeared to have expanded beyond just one conflict, leaving many wondering whether the Trump-chaired board, which comprises nearly two dozen countries, is aiming to sideline the United Nations.
US missiles and aircraft struck three Iranian nuclear facilities last June, and the White House was reportedly discussing new options for a strike this week.
The US military has been increasing its presence in the region in recent weeks, including the deployment of the USS Abraham Lincoln aircraft carrier.
The British government has not given the US permission to use UK military bases to support any potential attack on Iran.
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In previous military operations in the Middle East, the US used RAF Fairford in Gloucestershire and Diego Garcia, the UK overseas territory in the Indian Ocean.
Satellite images have also revealed that Iran has strengthened military facilities, and the country's Supreme Leader, Ayatollah Ali Khamenei, has posted threatening messages on social media directed at US forces.
One of Khamenei's posts read, "The US President constantly says that the US has sent a warship towards Iran. Of course, a warship is a dangerous piece of military hardware."
"However, even more dangerous than that warship is the weapon that can send that warship into the depths of the sea."
Several members of the US Congress have opposed any military action against Iran.
Democrat Ro Khanna of California and Republican Thomas Massie of Kentucky have said they will attempt to force a vote on the matter next week, citing the War Powers Act of 1973.
This act gives Congress the ability to check the president's power to involve the US in armed conflict.
"War with Iran would be very bad," Khanna posted on social media. "Iran is a difficult society of 90 million people with strong air defense and military capabilities."
He also said that thousands of US troops in the region "could be at risk of retaliation."
It is unlikely to pass in both houses of Congress.
In January, Senate Republicans blocked a similar War Powers resolution that would have required the Trump administration to seek congressional approval before launching further military operations in Venezuela following the capture of Nicolás Maduro.
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