Once more, it’s impossible to tell whether Donald Trump is serious — or, if he is, whether he knows how to make his radical ambitions real.

United Nations Secretary-General Antonio Guterres told President Donald Trump on Wednesday to avoid ethnic cleansing in Gaza after the U.S. leader proposed Palestinians resettle elsewhere and the United States take over the war-torn enclave.

In the lead-up to Netanyahu’s visit, Trump had suggested he wanted roughly two million Gazans forcibly removed from their homes so that they could be transferred to neighboring Arab countries like Egypt and Jordan.