The sixth round of U.S.-Iran nuclear talks will be held on Sunday in Muscat, the Omani foreign minister said on Thursday, after U.S. President Donald Trump reiterated that Tehran would not be allowed to have a nuclear weapon.

CNBC’s “Power Lunch” is joined by Helima Croft, head of commodity strategy at RBC Capital Markets, to discuss oil markets, tensions rising in the Middle East and more.

Iran has warned it will ramp up its nuclear activities after the United Nations nuclear watchdog’s 35-member board of governors adopted a resolution Thursday declaring it in breach of its non-proliferation obligations.

The US envoy is expected to arrive in Oman next week to participate in the sixth round of nuclear talks between the US and Iran, even as the US prepapres to evacuate nonessential personal for its Baghdad embassy.

The IAEA is expected to vote on a draft resolution stating that Iran has not provided answers and is violating commitments regarding the nuclear agreement.

U.S. President Donald Trump said he was less confident that Iran will agree to stop uranium enrichment in a nuclear deal with Washington, according to an interview released on Wednesday.