WASHINGTON (AP) - More than 200 members of Congress are backing a court challenge to President Barack Obama's plan to curtail greenhouse gas emissions.

WASHINGTON (AP) More than 200 members of Congress are backing a court challenge to President Barack Obama's plan to curtail greenhouse gas emissions.

A brief filed Tuesday with the U.S. Court of Appeals in Washington argues that the Environmental Protection Agency overstepped its legal authority by regulating carbon dioxide emissions.

Led by Senate Majority Leader Mitch McConnell and House Speaker Paul Ryan, those signing on include senators and Republican presidential candidates Ted Cruz and Marco Rubio. Sen. Joe Manchin of coal-dependent West Virginia is the group's lone Democrat.

About two dozen mostly GOP-led states have sued to stop the Clean Power Plan, which aims to slow climate change by cutting power-plant emissions by one-third by 2030. The Supreme Court has delayed implementation of the plan until the legal challenges are resolved.