In long-awaited confirmation hearing on Tuesday, US President-elect Donald Trump's nominee for the nation’s next defense secretary was questioned over his "brutal" remarks on women in the military and excessive drinking.

"Please explain these types of statements because they're brutal and they're mean and they disrespect men and women who are willing to die for this country," Senator Kirsten Gillibrand asked Pete Hegseth, appearing before the Senate Armed Services Committee.

"Senator, I appreciate your comments, and I would point out I've never disparaged women serving in the military. I respect every single female service member that has put on the uniform past and present," he said.

Citing Hegseth's previous “terrible” remarks opposing women serving in combat roles, Gillibrand challenged the nominee, saying: "Please do not deny that you’ve made those statements… You’re basically saying women, after they have children, can’t ever serve in the military to combat roles. It’s a silly thing to say ... (It’s) beneath the position that you are aspiring to.”

Hegseth sought to walk back his comments criticizing women serving in combat roles, but Sen. Jeanne Shaheen also criticized Hegseth, saying: "What do you have to say to the almost 400,000 women who are serving today about your position on whether they should be capable to rise through the highest ranks of our military?"

Hegseth said that if he was confirmed for the post, he would "be honored to have the opportunity to serve alongside you, shoulder to shoulder, men and women, black, white, all backgrounds with a shared purpose."

"Our differences are not what define us. Our unity and our shared purpose is what define us, and you will be treated fairly, with dignity, honor and respect, just like every man and woman in uniform, just like the men and women that I’ve worked with in my veterans organizations," he added.

'Maybe you'll go back to your old views'

When Sen. Joni Ernst asked whether he would support women continuing to have the opportunity to serve in combat roles, Hegseth said: "Yes, women will have access to ground combat roles given the standards remain high."

Sen. Elizabeth Warren, for her part, asked what has changed in Hegseth's views on women in the military in the space of just a few weeks, referring to how recent some of his controversial comments are.

"I understand many women serving in the military right now might think that if you can convert so rapidly, your long-held and aggressively pursued views in just 32 days, that 32 days after you get confirmed, maybe you'll just reverse those views and go back to the old guy who said: 'Straight up, women do not belong'," Warren said.

In addition to his controversial remarks about women in the military, Hegseth also faces allegations of sexual assault stemming from a 2017 incident in Monterey, California. Local police investigated the assault claim but did not file charges against Hegseth.

Hegseth, 44, seen as one of Trump’s more controversial Cabinet nominees, also faces allegations of excessive drinking and financial mismanagement.

Trump is set to take office next Monday, returning to the White House after a four-year absence.

'False anonymous reports'

Some senators challenged Hegseth over reports of execessive drinking.

"I have read multiple reports of your regularly being drunk at work, including by people who worked with you at Fox News,” Senator Mazie Hirono asked Hegseth.

"Senator, those are multiple false anonymous reports peddled by NBC News that run directly contradictory to the dozens of men and women at Fox News Channel who I work with who came on the record and said they never see that," Hegseth replied.

"You recently promised some of my Republican colleagues that you stopped drinking, and won’t drink if confirmed, correct?” she added. Hegseth confirmed it to be "absolutely" true.

"Will you resign as secretary of defense if you drink on the job, which is a 24/7 position?" Hirono said.

While Hegseth started to answer the question indirectly, Hirono repeated the question.

"I've made this commitment on behalf of the men and women I'm serving because it's the most important deployment of my life," Hegseth said.

"I’m not hearing an answer to my question, so I will move on," Hirono said. "While you have made that commitment, you will not commit to resigning if you drink on the job."

Separately, Sen. Tim Kaine pushed out the allegations of drunkenness against Hegseth.

"One of your colleagues said that you got drunk at an event at a bar and chanted, ‘Kill all Muslims.’ Another colleague, not anonymous, we have this, said you took co-workers to a strip club, you were drunk, you tried to dance with strippers, you had to be held off the stage,” Kaine said.

“One of your employees in that event filed a sexual harassment charge as a result of it," Kaine said. "Isn’t that the kind of behavior, if true, would be disqualifying to be secretary of Defense?"

Hegseth dismissed the allegations as "anonymous false charges".