Sen. Elizabeth Warren (D-Mass.) on Tuesday slammed 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's nominee to be the next Pentagon chief over ethics concerns related to his earlier employment at a top defense firm.

Warren said Army Secretary Mark Esper Mark EsperOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Overnight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Official: Pentagon has started 'prudent planning' for full Afghanistan withdrawal by May MORE should not be confirmed as Defense secretary unless he takes additional steps to further distance himself from his previous employer, Raytheon.

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“Secretary Esper, the American people deserve to know that you’re making decisions in our country’s best security interest, not in your own financial interest,” Warren said during Esper's confirmation hearing before the Senate Armed Services Committee. “You can’t make those commitments to this committee, that means you should not be confirmed as secretary of Defense.”

Esper who recently had to step aside as acting Defense secretary to complete the nomination process, was Raytheon’s vice president for government relations from 2010 to 2017, a role that Warren said raises red flags about potential conflicts of interest since the company has defense contracts worth billions of dollars.

Warren, a Democratic presidential candidate, raised similar concerns last week in a letter to Esper when she urged him to extend his commitment to recuse himself from matters involving Raytheon through the duration of his tenure at the Pentagon. Esper in 2017 signed a two-year agreement saying he will not be involved in matters related to Raytheon, but that agreement ends in November.

Esper insisted Tuesday that Pentagon ethics advisers recommended he not extend the recusal.

“I’ve lived an ethical life. I'm going to continue to live by those ethics, those principles, whether it involves Raytheon or any other company for that matter,” he said.

It would be difficult for Esper to stay out of all Raytheon-related decisions, as the firm holds numerous Pentagon contracts. A full recusal could prevent him from reaching out to the firm if issues arise with a particular contract or system.

The exchange between Warren and Esper quickly grew heated, with Warren questioning him on at least $1 million in deferred payments from Raytheon which he is set to receive after 2022.

Warren — who in May introduced legislation that would impose a lifetime ban on former lawmakers and Cabinet members from lobbying — asked Esper if he would commit to forgoing employment with a defense contractor, or payments of any kind from a defense firm, for at least four years after his government service.

“No senator, I will not,” Esper replied.

“I went to war for this country, I served overseas for this country, I’ve stepped down from jobs that have paid me well more than what I was working anywhere else, and each time it was to serve the public good and to serve the young men and women of our armed services,” he said. “So no, I disagree. I think the presumption is, for some reason, anybody who comes from the business or the corporate world is corrupt.”

Warren continued to question Esper until Committee Chairman James Inhofe James (Jim) Mountain InhofeChamber of Commerce endorses McSally for reelection Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Top admiral: 'No condition' where US should conduct nuclear test 'at this time' MORE (R-Okla.) ended the exchange.

“This is outrageous,” Warren replied.

Exchange between @SenWarren and Defense Secretary Nominee @EsperDoD on @Raytheon, ethics, waivers and conflicts of interest.



ESPER: "I think this is a good debate –"



WARREN: "I'm not trying to have a debate." pic.twitter.com/iu1Chu17ie — CSPAN (@cspan) July 16, 2019

Following the sparring, GOP committee members came to Esper's defense.

“I’m very disappointed that Sen. Warren would demonize you after your decades of service simply because you served in the private sector," said Sen. Rick Scott (R-Fla.). "I guess she just needed a moment for her presidential campaign.”

Inhofe told Esper that the exchange “was unfair and you handled it beautifully.”

The debate is unlikely to derail Esper’s nomination, as lawmakers are keen to see the role filled on a permanent basis. The post has been held by acting secretaries since the beginning of the year, after former 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 left at the end of December.