White House counselor Kellyanne Conway is hitting back at former Secretary of State John KerryJohn Forbes KerryRomney earns rants and raves for secret Twitter name Overnight Energy: Farmers say EPA reneged on ethanol deal | EPA scrubs senators' quotes from controversial ethanol announcement | Perry unsure if he'll comply with subpoena | John Kerry criticizes lack of climate talk at debate John Kerry calls out lack of climate questions at debate MORE after he criticized President Trump's decision to pull the U.S. out of the Paris climate agreement.

“Once a politician always a politician,” Conway said Friday on Fox News of Kerry, the Democrats' 2004 nominee for president.

“I think it’s a very disappointing assessment, and it tells you why he lost when he ran for president and why his friend Hillary ClintonHillary Diane Rodham ClintonSanders: 'Outrageous' to suggest Gabbard 'is a foreign asset' Clinton attacks on Gabbard become flashpoint in presidential race Saagar Enjeti: Clinton remarks on Gabbard 'shows just how deep the rot in our system goes' MORE lost this past time, because people don’t feel in this country like they put America first and the American worker first,” she added.

President Trump announced he would pull the U.S. out of the climate deal Thursday, calling it “unfair at the highest level to the United States.”

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Kerry and the Obama administration played an instrumental role in negotiating the Paris accords. The former Massachusetts senator even signed the deal with his granddaughter sitting on his lap.

Kerry blasted Trump's decision earlier Friday.

“He’s [President Trump] made us an environmental pariah in the world. And I think it is one of the most self-destructive moves I’ve seen by a politician in my lifetime,” Kerry said on MSNBC.