Prince Mohammed bin Salman's comments were published after Saudi air defense forces intercepted a ballistic missile that Saudi Arabia said was fired toward Riyadh on Saturday by the Iran-allied Houthi militia, which controls large parts of neighboring Yemen.
Such crackdowns have proven a reliable tool for governments from Brazil to Russia seeking to remove rivals and build legitimacy.
An official in Aoun's office said Wednesday that Hariri is still considered the prime minister.
"We need to calm down the situation".
Humanitarian flights to Yemen were grounded and ships ordered to leave, resulting in immediate price hikes in the rebel-held capital, Sanaa.
On North Korea, too, Tillerson has played a more diplomatic line, saying that talks would always be possible between Pyongyang and Washington, whereas Trump has said negotiations with Kim Jong Un would be pointless.
In reaction to the missile, the Saudi-led coalition closed all air, land and sea ports to the impoverished country.
In China, Xi has made similar pledges to make his country a place where "nobody dares to be corrupt".
Saudi Arabia's increasingly powerful Crown Prince Mohammed bin Salman has stepped up its confrontation with Iran.
Late Saturday, authorities in the Gulf powerhouse launched what they said was an anti-graft drive which netted dozens of high-profile businessmen and politicians.
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The ever-looming threat of prosecution has provided Xi a cudgel to push through policies.
Brent crude hit $64.65 earlier this week, its highest since mid-2015, as political tensions in the Middle East escalated after a sweeping anti-corruption purge in top crude exporter Saudi Arabia, which in turn has confronted Iran over the conflict in Yemen.
Saudi U.N. Ambassador Abdallah Al-Mouallimi echoed Haley's call for U.N. action against Iran in a letter to the U.N. Security Council and Secretary-General Antonio Guterres later on Tuesday, seen by Reuters.
The Houthis have nevertheless vowed to continue targeting Saudi Arabia as well as the United Arab Emirates, a key member of the coalition.
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The Saudis say Qatar supports radicals and is too cozy with Iran.
Iranian Foreign Minister Mohammad Javad Zarif retorted that "the allegations by Saudi officials were contrary to reality", a foreign ministry spokesman said.
Haley said the missile was not present in Yemen before the civil war. Some 83 percent of Chinese people surveyed by the Pew Research Center last year described corruption as a bigger problem than any other issue. "They don't have one of the most effective", he said.
Iran has denied supplying the Houthi with missiles and other weapons and said the launch aimed at Riyadh was an "independent" reaction by Yemen.
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