United States and Israel will have senior-level high stake talks at the White House early next week regarding Iran’s nuclear program, a source close to the situation disclosed on Thursday.

The negotiations come after a recent letter from US President Donald Trump to Iran’s Supreme Leader Ayatollah Ali Khamenei, where Trump threatened Tehran to either negotiate a nuclear agreement with Washington or risk possible military action. Khamenei rejected the message, saying that Iran would not be bullied into negotiations.

Headlining the Israeli delegation will be Strategic Affairs Minister Ron Dermer and National Security Adviser Tzachi Hanegbi, who will convene with senior US officials to discuss potential US-Iran nuclear talks and wider regional security issues.

Tensions between Iran and Washington have grown since Trump came back to power in January, resuming a “maximum pressure” policy designed to strangle Iran’s economy and starve it of crude oil exports. Trump pulled the US out of the 2015 nuclear deal in 2018, leaving Iran with limits on its nuclear program in return for relief from sanctions. Iran subsequently broke those limits, making major strides in its nuclear program.

The meeting follows US military action in the region. Trump directed large-scale assaults on Yemen’s Iran-aligned Houthi rebels at the weekend as retaliation for their Red Sea ship attacks. Trump also threatened Iran with responsibility if it would not contain its regional proxies.

Israel, now fighting Iran-supported Hamas in Gaza, has highlighted that it wishes to coordinate with Washington on any move against Iran. Israeli air raids have over the last year attacked Iranian military sites, significantly debilitating Tehran’s conventional military capacity, US officials and experts say.