Forty-nine senators, including one Republican, blasted Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE’s recommendations on transgender troops, saying they are not supported by evidence and represent a return to the days of “don’t ask, don’t tell.”

“The recommendations and report break faith with the men and women serving in our military by establishing a new ‘Don’t Ask, Don’t Tell’ for transgender service members, permitting them to serve only if they are willing to forego any chance of living as their true selves,” the senators wrote in a letter to Mattis on Thursday.

“Just as our mistaken policy regarding lesbian, gay and bisexual service members harmed readiness and ultimately was repealed, the implementation of your recommendations will also harm our nation’s military. Accordingly, we are opposed to the implementation of this discriminatory policy.”

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The letter was organized by Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.). The one Republican signatory was Sen. Lisa Murkowski Lisa Ann MurkowskiSenate GOP aims to confirm Trump court pick by Oct. 29: report Senate GOP sees early Supreme Court vote as political booster shot Pence defends Trump's 'obligation' to nominate new Supreme Court justice MORE (R-Alaska). Only one member of the Democratic caucus, Sen. Joe Manchin Joseph (Joe) ManchinThe Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (W.Va.), did not sign the letter.

Last month, President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE signed a memo banning most transgender people from serving in the military “except under certain limited circumstances.” The memo gave Mattis and Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenDHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections Democrats smell blood with new DHS whistleblower complaint MORE, who oversees the Coast Guard, “authority to implement any appropriate policies concerning military service by transgender individuals.”

No new policy can go into effect immediately, as courts have issued preliminary injunctions that require the Pentagon to continue allowing open service while lawsuits work their way through the court system.

Trump’s memo was signed in conjunction with the release of a report Mattis submitted to the president outlining his recommendations on how to handle transgender troops.

In Senate Armed Services Committee hearings over the last two weeks, Gillibrand has been asking the military chiefs whether they are aware of unit morale, cohesion and disciplinary issues as a result of open service by transgender troops.

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The chiefs of the Army, Air Force, Navy and Marines replied they have no reports of any issues. On Thursday, Joint Chiefs Chairman Gen. Joseph Dunford told Gillibrand such reports would not normally get to his level.

Mattis, meanwhile, argued Gillibrand’s question was flawed.

“These issues like this would not come to service chief level generally unless it was a very, very, I would call it, newsworthy situation, and the reason is that under the [former Defense Secretary Ash] Carter policy, the reporting is opaque,” Mattis told Gillibrand on Thursday.

“We cannot report that a problem emanated from a transgender. We cannot, under the Carter policy, do that. So the question you’ve asked the service chiefs and the chairman are ones that, right now, the Carter policy prohibited that very information from coming up because it’s private information and it’s specifically called out in his policy statement, so it’s impossible for them to respond to you.”

In the letter Thursday, the senators said Mattis’s recommendations “came as a surprise” to them.

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That’s “particularly in light of the many statements — from all levels of military and political leadership under your tenure — arguing that open service has had no impact on readiness or good order and discipline, and that transgender service members should be treated with dignity and respect and allowed to serve as long as they meet the standards,” the senators wrote.

While Mattis’s recommendations claim to be “informed by the department's own data and experience obtained since the Carter policy took effect,” they continued, the recommendations are actually “not grounded in any reported experience from the last two years.”

“For example, the report asserts that ‘[t]he potential for discord in the unit during the routine execution of daily activities is substantial and highlights the fundamental incompatibility of the department's legitimate military interest in uniformity, the privacy interests of all Service members, and the interest of transgender individuals in an appropriate accommodation.’ Given that the department’s experience with open service should, after almost two years, include ‘routine execution of daily activities,’ it is telling that this conclusion is offered without evidence of such ‘discord,’” they wrote.

Further, they said, policies banning transgender service would undermine morale and make it harder to recruit by sending a message to young people that the military is outdated.

“We strongly oppose your recommendations,” the senators concluded. “Rather than a policy which excludes all transgender individuals, the military should establish a policy which includes all Americans who are willing to serve and a policy that reasonably protects the military’s interest as an employer in providing necessary medical care for those willing to serve our country.”