Donald Trump’s sharing of alleged classified intelligence to Russian officials in the White House has come under scrutiny amid a large-scale attack by the Hamas Islamist military group against Israel.

In May 2017, the former president defended his actions after he was found to have discussed sensitive details about an alleged Islamic State (ISIS) plot with Russian Foreign Minister Sergei Lavrov and Ambassador Sergey Kislyak in the Oval Office. Trump said he had an absolute right to do so. The intel was said to have been provided to the U.S. from Israel.

It was suggested at the time that the former president’s handing over sensitive information from Israel could have damaged the relationship between the two countries. It also could have raised the possibility that the details could be passed from Russia to Iran, the Gulf nation that is a fierce adversary of Israel and has long supported Hamas.

On Saturday, Hamas, designated a terrorist group by the U.S. and the European Union, launched a large-scale attack against Israel, resulting in the deadliest day of violence in the Israel-Palestine conflict for decades. More than 700 people have been killed in Israel, and a further 400 in Gaza, since the incursion by Hamas, according to the Associated Press.