Rep. Bill Cassidy (R-La.), fresh off a runoff election victory over Sen. Mary Landrieu (D-La.), on Sunday described his party’s Senate takeover as a mandate from the American people.

Speaking on “Fox News Sunday” a day after helping the GOP pick up its 54th seat in the Senate, Cassidy said voters oppose President Obama’s agenda, particularly his health-care and environmental policies.

“We were the exclamation point on a message all of America has sent,” he said.

Cassidy specifically criticized Obama’s regulations for the coal and oil and gas industries.

The Republican's opponent, incumbent Sen. Mary Landrieu (D-La.), supported the Keystone XL oil pipeline, which would carry oil from Alberta to the gulf coast. But the Obama administration, facing pressure from environmental groups, has not approved the project.

“It’s the Republican Party that’s pushing use of U.S. natural resources to create American jobs,” Cassidy said. “It is the Democratic Party trying to kill those jobs.”