Washington, D.C.– Israel's devastating offensive in Gaza and U.S. support for it will "haunt" outgoing Secretary of State Antony Blinken for the rest of his life, a former diplomat who resigned last year in protest of the war said.

President Joe Biden's government is bypassing America's own regulations to continue arming Israel despite well-documented abuses in Gaza, Hala Larrit told Al Jazeera in a phone interview.

"They willfully - and I don't say this word lightly, willfully - violate and evade the laws of the United States," said Larritt, who resigned from the State Department in April.

"When I became a diplomat, I swore an oath to defend the Constitution. They are circumventing that process and continuing the flow of weapons because they know how disastrous it will be. To me, that is truly inexcusable , and it’s a criminal act.”

The United States has several laws prohibiting arms transfers to human rights abusers, including a ban on security aid to countries that block Washington-backed humanitarian aid.

The Leahy Act also limits U.S. assistance to military units credibly accused of serious human rights abuses, such as extrajudicial killings, torture, and rape.

In addition, the Biden administration has also adopted a policy called "National Security Memorandum 20" that requires allies that receive U.S. weapons to provide reliable assurances that their use of these weapons will not violate international humanitarian law.

Despite these safeguards, the United States continues to provide billions of dollars worth of weapons to Israel — which leading human rights groups say is committing genocide in Gaza.

Israel has killed at least 46,876 people in Gaza. It has also imposed a suffocating siege on the territory, triggering a deadly crisis of man-made hunger.

Last year, the International Criminal Court issued arrest warrants for Israeli Prime Minister Benjamin Netanyahu and his former defense minister Yoav Galante for war crimes, including using "starvation as a tactic of war."

However, Blinken has certified to Congress that Israel is not blocking humanitarian aid to Gaza - an assessment that aid groups reject.

Blinken's State Department has also been accused of failing to act on allegations of abuse by Israeli soldiers under the Leahy Act, prompting recent lawsuits against the Biden administration led by Palestinians and Palestinian Americans.

As a result, critics say, Blinken played an important role in ensuring that Israel continued to receive the weapons the United States used to destroy Gaza.

Blinken also oversaw the U.S. mission to the United Nations, which vetoed four Security Council resolutions calling for a ceasefire in Gaza.

The top U.S. diplomat has long been a staunch supporter of Israel, having faced Palestinian rights protesters at congressional hearings, on the streets and even in front of his home.

Just this week, several activists interrupted Blinken's speech at the Atlantic Council in Washington, D.C., calling him the "genocide secretary."

In Blinken's last appearance in the State Department briefing room on Thursday, a reporter was forcibly removed after repeatedly asking Blinken whether he was involved in Israel's alleged war crimes.

Larrit said it was natural to oppose the "slaughter and massacre of human beings" and predicted Blinken would continue to face protesters after leaving office on Monday.

"This will haunt him for the rest of his life," the former diplomat told Al Jazeera.

"History will certainly judge him, and it already does today. The question is: Will future administrations actually be held accountable for the crimes committed by this administration?"

The war in Gaza appears to be coming to an end after a ceasefire was agreed this week, with reports that President-elect Donald Trump will intervene.

For months, Israeli officials have pledged to press ahead with the war, with Israeli National Security Minister Itamar Ben-Gvir publicly bragging about thwarting efforts to end a deal to end the conflict and free Israeli prisoners in Gaza.

However, Blinken continued to insist that Hamas was "rocking the boat" in negotiations for the deal.

“I will tell you very bluntly, Blinken is lying,” Larrit said.

The former diplomat worked at the State Department for 18 years and served as Arabic-language spokesman before resigning last year. She is one of several U.S. officials to resign from the Biden administration over its uncompromising support for Israel.

Larrit said she was grateful for her departure because she felt she had been "silenced" when raising concerns about U.S. policies.

"I believe that as diplomats we should not implement or enforce policies that are illegal or inhumane and that are fundamentally inconsistent with U.S. national security interests," she told Al Jazeera.

"So there's no way I can continue in this situation."