The 34th US senator handed President Barack Obama victory on landmark Iran nuclear agreement, as she announced her support for the agreement.

The 34th US senator handed President Barack Obama victory on landmark Iran nuclear agreement, as she announced her support for the agreement.

Democratic Senator Barbara Mikulski announced on Wednesday that she would support the deal reached between Iran and the P5+1 group of countries -- the US, Britain, France, Russia, China, and Germany – in the Austrian capital, Vienna, on July 14.

“I have concluded that this Joint Comprehensive Plan of Action is the best option available to block Iran from having a nuclear bomb," the Maryland Democrat said in a statement.

"For these reasons, I will vote in favor of this deal. However, Congress must also reaffirm our commitment to the safety and security of Israel,” she added.

The US Congress is set to vote on a resolution of disapproval over the accord later this month as many Republicans are against it.

However, President Obama had earlier announced that he would veto the resolution. He needed 34 votes to uphold veto and now he has enough support.

Under the agreement, restrictions will be put on Iran’s nuclear activities in exchange for, among other things, the removal of all economic sanctions against the Islamic Republic.