Trump discussed counter terrorism operations in Syria with two Russian officials that he met with in the Oval Office the day after firing FBI Director James Comey, which he claimed would ease pressure from the Russia investigation. Russia’s ally in the region, Iran, is a longtime enemy of Israel, and funds the terrorist organization Hezbollah. The CIA was so concerned with security leaks that they later withdrew a high level informant from the Russian government.

Trump also told the officials that he was unconcerned with Russian interference in US elections.

The Wall Street Journal – Israel Provided Intelligence Trump Shared With Russia, Officials Say
The New York Times – Israel Said to Be Source of Secret Intelligence Trump Gave to Russians
Vanity Fair – Exclusive: What Trump really told Kislyak after Comey was canned
The Washington Post – Trump told Russian officials in 2017 he wasn’t concerned about Moscow’s interference in U.S. election