The Wall Street Journal reported on Tuesday that the United States continues to spy on Israeli Prime Minister Benjamin Netanyahu’s communications despite promising to curtail the hacking of its allies.

The Wall Street Journal reported on Tuesday that the United States continues to spy on Israeli Prime Minister Benjamin Netanyahu's communications despite promising to curtail the hacking of its allies.

Two years ago, after intelligence contractor Edward Snowden revealed the vast extent of the National Security Agency's online surveillance, President Barack Obama promised to limit spying on US allies.

Germany's Chancellor Angela Merkel had been embarrassed by the revelation that her cellphone had been monitored and other allies expressed private concerns about the breadth of NSA monitoring.

But, according to Journal report, Obama decided there was a "compelling national security purpose" in continuing to monitor some leaders, including Netanyahu and Turkey's President Recep Tayyip Erdogan.

The US administration decided not to remove or disable the "cyber-implants" it had secreted on foreign communications systems, as they would be hard to replace.

Instead, the report says, Obama ordered that some of the hacked systems used by close allies would not be routinely monitored by the NSA, while others would continue to be mined for intel.

"Going dark on Bibi? Of course we wouldn't do that," one senior US official told the Journal, speaking on condition of anonymity.