(Associated Press)

Iran charged Wednesday that the U.S. “has crossed every limit” in international relations by expressing support for Iran’s anti-government protesters and said President Donald Trump’s “absurd tweets” have encouraged disruption.

In a letter to U.N. officials, Iranian Ambassador Gholamali Khoshroo complained that Washington was intervening “in a grotesque way in Iran’s internal affairs.” He said Trump and Vice President Mike Pence were personally stirring up trouble.

“The President and Vice-President of the United States, in their numerous absurd tweets, incited Iranians to engage in disruptive acts,” the ambassador wrote to the U.N. Security Council president and U.N. Secretary-General Antonio Guterres.

The U.S. didn’t immediately respond to the letter, which maintains that Washington “has crossed every limit in flouting rules and principles of international law governing the civilized conduct of international relations.”

At least 21 people have been killed and hundreds arrested in Iran during a week of anti-government protests and unrest over economic woes and official corruption. Meanwhile, tens of thousands of people took part in counter-demonstrations Wednesday backing the clerically overseen government, which has said “enemies of Iran” are fomenting the protests.

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Trump has unleashed a series of tweets in recent days backing the protesters, saying Iran is “failing at every level” and declaring that it is “time for change” in the Islamic Republic.

“Such respect for the people of Iran as they try to take back their corrupt government,” he tweeted Wednesday. “You will see great support from the United States at the appropriate time!”

Trump’s U.N. envoy, Ambassador Nikki Haley, called Tuesday for an emergency Security Council meeting on Iran, saying the U.N. needed to speak out in support of the protesters.

As yet, no meeting has been scheduled.

Guterres is following the developments in Iran with concern, deputy spokesman Farhan Haq said earlier Wednesday. He said the secretary-general urged respect for free-expression rights and stressed that any demonstrations should be peaceful.