Sen. John Barrasso, R-Wyo., has penned a letter to Energy Secretary Jennifer Granholm, demanding details on taxpayer-related costs to send Energy Department employees to the 2021 United Nations Climate Change Conference (COP26) in Scotland.

"According to Time magazine, COP26 will be the 'most expensive COP on record,'" Barrasso wrote. "In an effort to understand the full cost the taxpayers will bear for this two week international conference, I ask that you answer the attached questions."

BIDEN APPEARS TO FALL ASLEEP DURING CLIMATE SPEECH DESPITE CLAIMING IT'S 'GREATEST THREAT' TO US SECURITY

FILE - In this March 20, 2018, file photo, Sen. John Barrasso, R-Wyo., right speaks with Sen. Rob Portman, R-Ohio, after a Republican policy luncheon on Capitol Hill in Washington. On Tuesday, Aug. 21, 2018, Barrasso fended off a well-funded challenger in Wyoming's Republican primary and will face Wilson businessman Gary Trauner in the general election. Trauner ran unopposed for the Democratic nomination. (AP Photo/Jacquelyn Martin, File)

Sen. John Barrasso, an outspoken Trump supporter, won handily in the GOP U.S. Senate primary in Wyoming Tuesday. (AP)

Barrasso also said he is "concerned that what appears to be a bloated US delegation will prove counterproductive to the COP's mission, pointing out a "tone of insincerity" as the majority of COP 26 delegates "will have contributed a significant amount of carbon emissions" to attend the conference.

Instead of attending the conference in person, Barrasso hinted that U.S. officials should have used technological means to attend the conference. 

"It is rather perplexing that in this new age of digital communication and during an ongoing pandemic, executive branch departments and agencies are unnecessarily choosing to contirbute directly to carbon emissions and risk exposure to COVID-19," he wrote.

Energy Secretary Jennifer Granholm speaks during a press briefing at the White House, Tuesday, May 11, 2021, in Washington. (AP Photo/Evan Vucci)

Energy Secretary Jennifer Granholm speaks during a press briefing at the White House, Tuesday, May 11, 2021, in Washington. (AP Photo/Evan Vucci)

"DOE's decision to attend COP 26 comes as many executive branch employees have been forced to work from home for more than a year and a half," Barrasso stated in the letter. "If they cannot go to work here in the U.S., they should not be permitted to attend extravagant conferences across the globe."

The international air travel by the delegates also comes amid a proposal from President Biden's administration to reduce U.S. emissions 50%-52% below 2005 levels by 2030, roughly double the previous U.S. goal.

WASHINGTON, DC - AUGUST 01:  Sen. John Barrasso (R-WY) talks to reporters following the Republican Senate policy luncheon at the U.S. Capitol August 1, 2017 in Washington, DC.

WASHINGTON, DC - AUGUST 01:  Sen. John Barrasso (R-WY) talks to reporters following the Republican Senate policy luncheon at the U.S. Capitol August 1, 2017 in Washington, DC. (Chip Somodevilla/Getty Images)

CLICK HERE TO GET THE FOX NEWS APP

Barrasso requested a response to his questions from Sec. Granholm by no later than Nov. 15.

Fox News reached out to the Energy Department but did not receive an immediate response.