'He's so unattractive, it's unbelievable': Hot mic catches GOP senator joking about congressman who threatened a duel

Republican Sen. Susan Collins was caught on a hot mic Tuesday calling Texas Republican Rep. Blake Farenthold "unattractive" during a legislative session Tuesday morning.

Last week, Farenthold singled out "female senators from the Northeast" as being responsible for hampering the Senate's effort to repeal and replace the Affordable Care Act, better known as Obamacare.

Collins, of Maine, along with West Virginia Sen. Shelley Moore Capito and Alaska Sen. Lisa Murkowski, have opposed to the Senate's proposal to repeal and replace Obamacare.

Protests against the Republican health care bill:

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Protests against the Republican health care bill
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Protests against the Republican health care bill
THE PARK IMPERIAL AT 230 WEST 56TH ST , NEW YORK, UNITED STATES - 2017/07/10: New Yorkers and healthcare advocacy groups organized a protest on July 10, 2017; outside Rep. John Faso's fundraiser as donors arrive at the Park Imperial at 230 West 56th St. in Midtown Manhattan. Faso voted for the House Trumpcare bill in May, he also coauthored the notorious Collins-Faso amendment to both the House and Senate bills that would shift New York Medicaid funding from counties budgets to the state budget. (Photo by Erik McGregor/Pacific Press/LightRocket via Getty Images)
A healthcare activist protests to stop the Republican health care bill at Russell Senate Office Building on Capitol Hill in Washington, U.S., July 17, 2017. REUTERS/Yuri Gripas
Healthcare activists protest to stop the Republican health care bill at Russell Senate Office Building on Capitol Hill in Washington, U.S., July 17, 2017. REUTERS/Yuri Gripas
Healthcare activists get a police warning during a protest to stop the Republican health care bill at Hart Senate Office Building on Capitol Hill in Washington, U.S., July 17, 2017. REUTERS/Yuri Gripas
Healthcare activists protest to stop the Republican health care bill at Hart Senate Office Building on Capitol Hill in Washington, U.S., July 17, 2017. REUTERS/Yuri Gripas
WASHINGTON, DC - JULY 10: A demonstrater from Arizona chants, 'Kill the bill or lose your job' while sitting on the floor outside the offices of Sen. Jeff Flake (R-AZ) during a protest against health care reform legislation in the Russell Senate Office Building on Capitol Hill July 10, 2017 in Washington, DC. More than 100 people from across the country were arrested during the protest that was organized by Housing Works and Center for Popular Democracy. (Photo by Chip Somodevilla/Getty Images)
NEW YORK COUNTY REPUBLICAN OFFICE, NEW YORK, UNITED STATES - 2017/07/05: The Socialist Feminists of Democratic Socialists of America (DSA) organized a protest outside of the New York County Republican Office in New York City on July 5, 2017; to tell Republicans that is it despicable and undemocratic that they are trying to ram Trumpcare through the Senate without debate or public hearings. (Photo by Erik McGregor/Pacific Press/LightRocket via Getty Images)
UNITED STATES - JULY 10: Health care protesters from Arkansas chant outside of the office of Sen. John Boozman, R-Ark., in the Hart Senate Office Building on Monday, July 10, 2017. About a dozen people loudly voiced opposition to the GOP health care bill. (Photo By Bill Clark/CQ Roll Call)
THE PARK IMPERIAL AT 230 WEST 56TH ST , NEW YORK, UNITED STATES - 2017/07/10: New Yorkers and healthcare advocacy groups organized a protest on July 10, 2017; outside Rep. John Faso's fundraiser as donors arrive at the Park Imperial at 230 West 56th St. in Midtown Manhattan. Faso voted for the House Trumpcare bill in May, he also coauthored the notorious Collins-Faso amendment to both the House and Senate bills that would shift New York Medicaid funding from counties budgets to the state budget. (Photo by Erik McGregor/Pacific Press/LightRocket via Getty Images)
NEW YORK, NY - JULY 5: A small group of activists rally against the GOP health care plan outside of the Metropolitan Republican Club, July 5, 2017 in New York City. Republicans in the Senate will resume work on the bill next week when Congress returns to Washington after a holiday recess. (Photo by Drew Angerer/Getty Images)
A small group of activists rally against the GOP health care plan outside of the Metropolitan Republican Club, July 5, 2017 in New York City. Republicans in the Senate will resume work on the bill next week when Congress returns to Washington after a holiday recess. (Photo by Zach D Roberts/NurPhoto via Getty Images)
Healthcare activists protest to stop the Republican health care bill at Russell Senate Office Building on Capitol Hill in Washington, U.S., July 10, 2017. REUTERS/Yuri Gripas
Healthcare activists are detained after a protest to stop the Republican health care bill at Hart Senate Office Building on Capitol Hill in Washington, U.S., July 17, 2017. REUTERS/Yuri Gripas
A staff members asks the media to leave the room as Healthcare activists protest in the office of Senator Jeff Flake (R-AZ) to stop the Republican health care bill at Russell Senate Office building on Capitol Hill in Washington, U.S., July 10, 2017. REUTERS/Yuri Gripas
U.S. Capitol police arrest demonstrators in wheelchairs protesting against the AHCA health care bill put forward by President Trump and Congressional Republicans as several dozen protestors are taken into custody after refusing to leave the rotunda of the U.S. Capitol in Washington, U.S., March 22, 2017. REUTERS/Jim Bourg
Demonstrators hold signs during a protest against the repeal of the Affordable Care Act outside the Capitol Building in Washington, U.S., March 22, 2017. REUTERS/Aaron P. Bernstein
Healthcare activists are detained after a protest to stop the Republican health care bill at Russell Senate Office Building on Capitol Hill in Washington, U.S., July 17, 2017. REUTERS/Yuri Gripas
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Farenthold said that "if it was a guy from south Texas" opposing the legislation, "I might ask him to step outside and settle this Aaron Burr-style."

Collins referenced Farenthold's comments on Tuesday morning while speaking to a male senator during a subcommittee hearing.

"Did you see the one who challenged me to a duel?" Collins asked her colleague.

"I know," he replied. "Trust me — you know why he challenged you to a duel? Because you could beat the s--- out of him."

Collins laughed and added, "He is so unattractive, it's unbelievable."

She later asked her colleague, "Did you see the picture of him in his pajamas next to this bunny?" before the microphone cut off.

Collins was likely referring to this photo:

The other senator wasn't immediately identified, but many reporters on Twitter speculated it was Sen. Jack Reed, the ranking Democratic member of the subcommittee.

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