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 on Tuesday shot down recently recirculated plans to privatize combat efforts in Afghanistan.

“When the Americans put their nation’s credibility on the line, privatizing it is probably not a wise idea,” Mattis told reporters at the Pentagon.

The former head of U.S. Central Command did not mention by name Erik Prince, the Blackwater founder who in recent weeks has shopped a plan to replace most U.S. troops in Afghanistan with private contractors.

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Mattis had been asked if there was an advantage to privatizing forces if there are going to be boots on the ground in Afghanistan for the foreseeable future.

About 14,000 U.S. military personnel are currently in Afghanistan to counter terrorist groups including the Taliban, al Qaeda and the Islamic State in Iraq and Syria, as well as to train and assist Afghan forces.

More than 3,000 troops were added to the fight after President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE in August 2017 announced a new strategy to turn around the war, which top generals had compared to a stalemate at the time.

Mattis that the U.S. military remains in the 17-year war “in order to ensure America’s security.”

“This is why we talk about an Afghan-led, Afghan-owned reconciliation process and we believe that the best way to get there is to ensure the Taliban recognizes they can’t win on the battlefield, they must negotiate,” Mattis said in his first Pentagon press conference since April.

Prince, whose sister is Education Secretary Betsy DeVos Elizabeth (Betsy) Dee DeVosSpecial counsel investigating DeVos for potential Hatch Act violation: report NEA president says Azar and DeVos should resign over school reopening guidance The Hill's 12:30 Report - Presented by Facebook - You might want to download TikTok now MORE, previously tried to sell Trump on his privatization plan last year. He has been pushing for it once more in media appearances, including on programs such as “Fox & Friends” that Trump is known to watch.

There is little backing for such a plan among defense officials and lawmakers.