Two top US House Democrats have announced that they would vote in favor of the Iran nuclear agreement in Congress later this month.

Steny Hoyer, the second-ranking Democrat in the House of Representatives, said on Tuesday that he will back the agreement.

"No matter how deep, how personal, and how sincere my concerns about this agreement are, they ultimately do not outweigh the need for a united position on Iran," Hoyer said in a statement.

Rep. Xavier Becerra, who is chairman of the House Democratic Caucus, also announced his support for the Joint Comprehensive Plan of Action (JCPOA) concluded by Iran and the P5+1 group of countries -- the US, Britain, France, China, Russia plus Germany -- in the Austrian capital, Vienna, on July 14.

"No deal is perfect. We can always think of ways of making a deal better. But thinking is not doing. And speculation won't stop Iran from reaching nuclear weapons capability," he said in a statement.

The announcement came shortly before both chambers of Congress open debate on the agreement early Wednesday morning.

On Tuesday, 42 Democratic and independent senators had announced support for the agreement.

House Democratic leader Nancy Pelosi of California is also working hard to bolster support for the accord. He has invited ambassadors from the five nations in the agreement to meet with House Democrats later Wednesday.

The Republican-dominated Congress is reviewing the nuclear agreement and has until September 17 to vote to either approve or disapprove of it.

Under the accord, 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.

A Democratic filibuster in the Senate would be a clear victory for Obama to nip the process in the bud and prevent a chance for the lobbying to kick into high gear.

If Democratic senators do not filibuster the Republican bill, President Obama will be forced to veto the resolution disapproving of the agreement if the Senate and House of Representatives both pass such a measure.

Analysts, however, believe the Obama administration is set to gain this resounding victory over its opponents, despite the Israel lobby’s massive campaign to kill the deal.