Hartley presented the reasons for which President Donald Trump had decided yesterday to pull the US out of the 2015 accord, with Pahor expressing concern over the move.
As for the future oversight of Iran's nuclear programme, Pahor shares concerns of his European counterparts and the EU's senior officials.
His office stressed that apart from the US withdrawing from the Iran deal and the Paris climate accord, it could also impose tariffs on European steel and aluminium.
However, Pahor is happy with the White House's determination to support a peaceful solution to conflicts in the Korean peninsula, his office said in a press release.
Pahor and Hartley hope and expect the traditional alliance between the EU and US to endure these trials and to continue to the benefit of world peace and security.
Hartley also met Foreign Ministry State Secretary Iztok Mirošič, who the ministry said expressed deep regret over Trump's decision and pledged Slovenia's continued support for the deal provided Iran's continued compliance with its commitments.
The state secretary warned of potential consequences that the US's withdrawal could have on security in the region. He also expressed concern over the impact of sanctions on the people of Iran and on the stability in the region as evident from migrations in the broader neighbourhood, including Europe.
Despite calls to the contrary, Trump delivered on his promise to withdraw the US from the agreement, which limited Iran's nuclear programme, and to reintroduce sanctions.
European allies regretted his decision, whereas Iran said that it would stick to the historical deal.
The Slovenian Foreign Ministry earlier regretted Trump's move, but stressed that Slovenia was committed to further support the deal if Iran continued to fully respect its obligations.
Parliamentary Speaker Milan Brglez labelled the withdrawal a major blow to international law, urging the EU and the other signatories to continue to respect the deal.
