Congress will vote this month on a resolution to disapprove of the White House-backed nuclear deal struck with Iran by the U.S., Russia, China, Britain, France and Germany. The deal aims to limit Iran's nuclear program in exchange for hundreds of billions of dollars in relief from international sanctions.

Republicans who control both chambers of Congress are unanimously opposed to the deal. They need a majority in the 435-member House and 60 of 100 votes in the Senate to pass the disapproval resolution.

If the resolution does pass, President Barack Obama has pledged to veto it. At that point, opponents would need to muster two-thirds majorities in both the House and the Senate to override Obama's veto.

In the Senate, 41 members have announced they support the deal, the number required to filibuster the disapproval resolution in the first place and prevent it from passing.

A breakdown of where the 46 members of the Democratic caucus in the Senate stand:

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SUPPORT (41)

Tammy Baldwin of Wisconsin

Michael Bennet of Colorado

Richard Blumenthal of Connecticut

Cory Booker of New Jersey

Barbara Boxer of California

Sherrod Brown of Ohio

Tom Carper of Delaware

Bob Casey of Pennsylvania

Chris Coons of Delaware

Joe Donnelly of Indiana

Dick Durbin of Illinois

Dianne Feinstein of California

Al Franken of Minnesota

Kirsten Gillibrand of New York

Martin Heinrich of New Mexico

Heidi Heitkamp of North Dakota

Mazie Hirono of Hawaii

Tim Kaine of Virginia

Angus King of Maine

Amy Klobuchar of Minnesota

Patrick Leahy of Vermont

Ed Markey of Massachusetts

Claire McCaskill of Missouri

Jeff Merkley of Oregon

Barbara Mikulski of Maryland

Chris Murphy of Connecticut

Patty Murray of Washington

Bill Nelson of Florida

Gary Peters of Michigan

Jack Reed of Rhode Island

Harry Reid of Nevada

Bernie Sanders of Vermont

Brian Schatz of Hawaii

Jeanne Shaheen of New Hampshire

Debbie Stabenow of Michigan

Jon Tester of Montana

Tom Udall of New Mexico

Mark Warner of Virginia

Elizabeth Warren of Massachusetts

Sheldon Whitehouse of Rhode Island

Ron Wyden of Oregon

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OPPOSED (4)

Ben Cardin of Maryland

Joe Manchin of West Virginia

Robert Menendez of New Jersey

Chuck Schumer of New York

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UNDECLARED (1)

Maria Cantwell of Washington

By AP