Sen. Bill Cassidy (R-La.) offered a blistering takedown of Donald Trump’s deal with Iran.

Speaking to reporters on Capitol Hill, Cassidy called the proposed deal between the Trump administration and Iran historically bad.

“The details that I’ve seen so far look … awful. This will go down as a tremendous foreign policy blunder,” Cassidy said.

The Trump administration released the text of the memorandum of understanding reached over the weekend with Iran.

The document calls for fighting to end on “all fronts,” including with respect to the Israeli campaign against Hezbollah in Lebanon, and the reopening of the Strait of Hormuz within 30 days.

It also says the U.S. and regional partners will finance at least $300 billion for a reconstruction fund for Iran. The U.S. will also end all sanctions on Iran, including on Iranian oil exports, while Tehran would commit to not producing nuclear weapons.

Both countries will sign the document at a ceremony in Switzerland on Friday.

Cassidy said the deal will only end up making Iran “stronger” and U.S. allies in the region “end up weaker.”

“Iran has learned that if they’re willing to grab that Strait of Hormuz and choke it off, they can get the Western world to dance to their tune,” Cassidy added. “I think [the deal is] a deep mistake.”