Former Secretary of State John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE fired back at Secretary of State Mike Pompeo Michael (Mike) Richard PompeoTreasury sanctions individuals, groups tied to Russian malign influence activities Navalny released from hospital after suspected poisoning Overnight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers MORE after he described Kerry’s continued contact with Iranian and other foreign diplomats as “unseemly and unprecedented.”

“Secretary Kerry stays in touch with his former counterparts around the world just like every previous Secretary of State, and in a long phone conversation with Secretary Pompeo earlier this year he went into great detail about what he had learned about the Iranian’s view. No secrets were kept from this administration,” a spokesperson for Kerry said in a statement to The Hill.

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“There’s nothing unusual, let alone unseemly or inappropriate, about former diplomats meeting with foreign counterparts … What is unseemly and unprecedented is for the podium of the State Department to be hijacked for political theatrics,” the spokesperson added.

Kerry played a crucial role in crafting the Obama-era Iran nuclear agreement. President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE sparked controversy after announcing he would withdraw the U.S. from the 2015 deal in May, despite being advised to remain in the pact. A United Nations watchdog said late last month that Iran is still complying with the accord.

Kerry told conservative radio host Hugh Hewitt this week that he had met with Iranian Foreign Minister Mohammad Javad Zarif “three or four” times since leaving office to discuss the Iran nuclear deal and other issues.

Trump accused Kerry Thursday of having “illegal meetings.”

“John Kerry had illegal meetings with the very hostile Iranian Regime, which can only serve to undercut our great work to the detriment of the American people. He told them to wait out the Trump Administration! Was he registered under the Foreign Agents Registration Act? BAD!” he tweeted.

John Kerry had illegal meetings with the very hostile Iranian Regime, which can only serve to undercut our great work to the detriment of the American people. He told them to wait out the Trump Administration! Was he registered under the Foreign Agents Registration Act? BAD! — Donald J. Trump (@realDonaldTrump) September 13, 2018

The Foreign Agents Registration Act requires those representing the interests of foreign powers to disclose those relationships and any related activities and finances.

Kerry said Wednesday on Fox News that he met with European and Iranian diplomats, but held that no negotiations were aimed at undermining the Trump administration’s policies.

Trump has expressed openness to renegotiating a new nuclear deal with Iran. But, late last month Iran’s Supreme Leader Ayatollah Ali Khamenei rejected that offer.

“Negotiations with former U.S. officials, who at least saved some face, bore such results! With current brazen U.S. officials—who have unsheathed their swords against Iranians—what negotiations can we have? Thus no negotiations with any U.S. official at any level will be held,” he tweeted.