Former Israeli Defense Forces military chief Amos Yadlin wrote Monday that Trump should hold off on negotiating changes to the Iran deal, reports the Jerusalem Post.

Yadlin, currently head of the Institute for National Security Studies, co-authored the essay advising the Trump administration to stick with the deal in the short term.

“Improving the deal is a goal which should be strongly pursued in the medium and long term, but only after creating the conditions of international pressure on Iran to cause it to accept the offered restrictions,” he wrote.

Sources within the White House reportedly said that Trump was leaning toward decertifying the Iran nuclear deal this week, though that action would simply push any decision on reimposing sanctions off to the US Congress.