Iran’s Supreme Leader, Ayatollah Ali Khamenei, rejected Donald Trump’s demand for unconditional surrender on Wednesday.

Speaking later to reporters outside the White House, Trump declined to say whether he had made any decision on whether to join Israel’s bombing campaign against arch-enemy Iran.

“I may do it. I may not do it. I mean, nobody knows what I’m going to do,” he said.

Trump said Iranian officials had reached out about negotiations including a possible meeting at the White House but “it’s very late to be talking,” he said.

“Unconditional surrender, that means I’ve had it.”

Asked for his response to Khamenei rejecting his demand to surrender, Trump said: “I say, good luck.”

Iranians jammed the highways out of the capital Tehran, a city of 10 million people, as residents sought sanctuary elsewhere from intensified Israeli airstrikes.

Khamenei rebuked Trump in a recorded speech played on television, his first appearance since Friday.

“Intelligent people who know Iran, the Iranian nation and its history will never speak to this nation in threatening language because the Iranian nation will not surrender,” he said.

Israel’s military said 50 Israeli jets struck around 20 targets in Tehran overnight, including sites producing raw materials, components and manufacturing systems for missiles.