US Secretary of State John Kerry has spoken to Israeli Prime Minister Benjamin Netanyahu as the Obama administration has secured enough votes to block a Senate resolution against the Iran nuclear agreement.

The US secretary of state discussed the Vienna nuclear accord with Netanyahu and reaffirmed Washington’s commitment to Israel’s security in a telephone call over the weekend, State Department spokesman John Kirby said on Tuesday.

"The secretary and the prime minister reiterated the need to continue pushing back on Iran's destabilizing activities in the region, and he agreed to continue to have these discussions in the coming weeks," Kirby told reporters in Washington, DC.

"The secretary reaffirmed the United States' commitment to Israel's security and continued military and security relationship," he added.

Kerry also said military cooperation with Israel will continue as before.

Iran and the P5+1 group of countries – the US, Britain, France, Russia, China, and Germany – announced the conclusion of nuclear negotiations in the Austrian capital on July 14.

Under the agreement, Iran has been recognized by the United Nations as a nuclear power and will continue its uranium enrichment program, but some restrictions will be placed on Iran’s nuclear program in exchange for the removal of sanctions.

The Israeli prime minister has vehemently opposed the nuclear agreement, which is being reviewed by the US Congress.

Netanyahu and the Israel lobby in the United States left no stone unturned in order to sink the accord in Congress.

However, President Barack Obama secured enough Senate support on Tuesday to block the vote on the Iran agreement even without issuing a veto as four more undecided Democratic senators came out in support of the deal.

The announcement by Senators Richard Blumenthal of Connecticut, Ron Wyden of Oregon, Gary Peters of Michigan and Senator Maria Cantwell of Washington brought the total number of senators who back the agreement to 42.

The level of support would potentially block passage of the resolution by paving the way for a filibuster of Republican attempts to disapprove of the Joint Comprehensive Plan of Action (JCPOA).