US President Donald Trump, concluding his Gulf tour in Abu Dhabi on Friday, said that Iran must quickly make a decision on a proposal put forward by Washington during the nuclear talks between the two countries, or "something bad will happen."

Before leaving the UAE capital, Trump stated that the United States had submitted a proposal to Iran for reaching an agreement.

"They have a proposal, and more importantly, they know they have to move quickly, or something bad will happen," the US president said.

The US President concluded his Gulf tour on Friday in the UAE, following stops in Saudi Arabia and Qatar, during which he concluded billions of dollars in deals and secured an investment pledge from Abu Dhabi exceeding $1 trillion.

Trump concluded a four-day tour that began Tuesday in Riyadh, then moved to Doha, and ended in Abu Dhabi.

Trump's first foreign tour of his second term saw massive deals in various sectors, the lifting of sanctions on Syria, and expressions of optimism regarding the nuclear agreement with Iran.

The US President was warmly received in the three countries, whose leaders Trump praised, saying he and Saudi Crown Prince Mohammed bin Salman had "a lot of affection" for each other. This contrasts sharply with the lukewarm Saudi-US relations that marked the beginning of his predecessor Joe Biden's term.

He also hinted from Qatar that an agreement on Iran's nuclear program was close, which would avoid military action, in an announcement that caused oil prices to fall.

Before leaving the UAE, Trump revisited the Iranian issue, saying that Washington had delivered a proposal to Tehran for reaching an agreement, adding, "They have a proposal, and more importantly, they know they have to move quickly or something bad will happen."

Trump did not announce any progress on the Gaza war during his visit to Qatar, which played a key mediating role in the truce talks. He reiterated in Doha that Washington should "take" the Gaza Strip and turn it into a "freedom zone."

But in Abu Dhabi, he acknowledged that "many are starving" in the besieged Strip, adding, "We will work to solve this problem."