Speaking at a fundraiser in New Jersey over the weekend, U.S. President Donald Trump predicted that he would have a new nuclear deal within four weeks if re-elected in November. In one sense, this is typical bluster from a president who has recently mused that his face should be carved on Mount Rushmore. At the same time, it highlights both a risk about a second Trump term and a truth about the Iranian regime his administration has pressured since taking office.

First, consider the risk. Trump has always explained his maximum pressure campaign as an effort to coerce Tehran to submit to better terms. By itself, there is nothing wrong with that. The 2015 nuclear deal forged by Trump’s predecessor was weak. Key limitations on the technology and scale of Iran’s enrichment program expired over time.

And Trump’s campaign has steadily increased pressure on the regime. The remaining loopholes in U.S. sanctions against Iran have been closed, and Iran’s most important general has been killed. Meanwhile, the United States is planning to introduce a U.N. Security Council resolution to extend an arms embargo on Iran set to expire in October.