Two Senate Democrats want the Environmental Protection Agency (EPA) to terminate immediately a contract it recently signed with a public affairs firm tied to numerous Republican causes.

The $120,000, no-bid contract with Definers Public Affairs is reportedly for “news analysis” services, such as monitoring media stories about the EPA.

But Sens. Sheldon Whitehouse Sheldon WhitehouseFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Hillicon Valley: Murky TikTok deal raises questions about China's role | Twitter investigating automated image previews over apparent algorithmic bias | House approves bill making hacking federal voting systems a crime House approves legislation making hacking voting systems a federal crime MORE (D-R.I.) and Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.) wrote in a Tuesday letter to EPA head Scott Pruitt Edward (Scott) Scott PruittJuan Williams: Swamp creature at the White House Science protections must be enforceable Conspicuous by their absence from the Republican Convention MORE that the contract, and Definers’s close ties to GOP advocacy and opposition research, “presents an appearance of impropriety to which you as administrator should never be a party.”

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EPA and Definers have consistently defended the contract since Mother Jones first wrote about it last week, saying it was reached in accordance with law and it is merely for media monitoring.

Definers, which has served numerous Republican clients, shares many features with America Rising PAC, America Rising Squared and Need to Know Network, such as offices and executives.

America Rising PAC says it was founded “for the sole purpose of exposing the truth about Democrats through video tracking, research and communications.”

On Saturday, The New York Times reported that a Definers Public Affairs vice president has been investigating EPA employees critical of Pruitt and President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's agenda.

Whitehouse and Harris accused the various GOP organizations of receiving significant funding from interests the EPA regulates, such as the energy industry.

America Rising Squared ran a campaign supporting Pruitt’s confirmation as EPA administrator, while Need to Know Network has published positive coverage of his work.

Whitehouse and Harris asked Pruitt to answer numerous questions about the Definers contract and provide various documents regarding it by Thursday.

The senators are not the only ones objecting to the Definers contract.

Public Citizen, on behalf of two liberal public relations firms, filed a formal protest of the contract with the Government Accountability Office, arguing that it does not comply with federal contracting rules.

“In the best-case scenario, the contract was outrageously issued on a sole-source basis for work that dozens of firms could perform, to a partisan firm that just so happens to be investigating EPA employees for opposition to President Donald Trump’s anti-science agenda,” Robert Weissman, president of Public Citizen, said in a statement.

“In the worst-case scenario, something far more nefarious is going on.”

And on Monday, the Environmental Working Group and American Oversight asked the EPA’s Office of Inspector General to investigate the contract.