A group of lawmakers on Monday called on Treasury Secretary Steven Mnuchin Steven Terner MnuchinLawmakers fear voter backlash over failure to reach COVID-19 relief deal United Airlines, unions call for six-month extension of government aid House Democrats plan to unveil bill next week to avert shutdown MORE to take a tougher stance on the terrorist group Hamas in Qatar.

In a letter addressed to Mnuchin, 19 members of Congress from both parties expressed concern that a joint statement earlier this year from Mnuchin and Qatari officials about cracking down on terrorist financiers did not address Hamas.

“As state sponsors of terror such as Iran renew their financial support for Hamas, it is critical that the United States isolate and counter Hamas by cutting the terrorist organization at its source,” the lawmakers wrote.

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Among the lawmakers who signed the letter were Reps. Josh Gottheimer Joshua (Josh) GottheimerCentrist House group offers bipartisan COVID-19 relief deal Hillicon Valley: Lawmakers introduce resolution condemning QAnon | US Cyber Command leader vows to 'defend forward' in protecting nation from cyberattacks House Democrats request briefing on seizure of terrorist cryptocurrency assets MORE (D-N.J.), Ron DeSantis Ron DeSantisNames to watch as Trump picks Ginsburg replacement on Supreme Court Key swing-state election lawsuits could help shape the presidential race First death reported from Hurricane Sally in Alabama MORE (R-Fla.), Jim Banks (R-Ind.), Ted Budd Theodore (Ted) Paul BuddHouse Dems introduce bill to require masks on planes and in airports Bipartisan bill introduced to require TSA to take temperature checks How to combat substance abuse during COVID-19 MORE (R-N.C.), Carlos Curbelo Carlos Luis CurbeloGOP wants more vision, policy from Trump at convention Mucarsel-Powell, Giménez to battle for Florida swing district The Memo: GOP cringes at new Trump race controversy MORE (R-Fla.), Mario Diaz-Balart Mario Rafael Diaz-Balart'Trump show' convention sparks little interest on K Street Rep. Dan Meuser tests positive for COVID-19 Watchdog calls for probe into Gohmert 'disregarding public health guidance' on COVID-19 MORE (R-Fla.), Chuck Fleischmann Charles (Chuck) Joseph FleischmannDemocrats may bring DHS bill to House floor GOP-Trump fractures on masks open up Former Surgeon General Vivek Murthy says public health threat of loneliness compounded by COVID-19; Trump says task force will 'evolve' MORE (R-Tenn.) and Louie Gohmert Louis (Louie) Buller GohmertRep. Dan Meuser tests positive for COVID-19 Watchdog calls for probe into Gohmert 'disregarding public health guidance' on COVID-19 Massie plans to donate plasma after testing positive for COVID-19 antibodies MORE (R-Texas).

Sent bipartisan letter with @RepJoshG to Treasury Secretary Mnuchin urging his department to adopt a comprehensive strategy for cracking down on Hamas. pic.twitter.com/PWTcemokmX — Ron DeSantis (@RepDeSantis) November 20, 2017

“We must have clear and verifiable steps to crack down on financial support for all terrorist organizations, especially Hamas,” the lawmakers wrote.

Earlier this year, four Middle East nations imposed a blockade against Qatar over allegations of funding terrorism, as well as its relations with Iran.

President Trump previously called Qatar “a funder of terrorism, and at a very high level.”