Tech entrepreneur Elon Musk threatened legal action Monday against Rep. Ro Khanna, D-Calif., after the lawmaker accused him of causing the deaths of millions of children through budget cuts implemented by the Department of Government Efficiency (DOGE).

"Time to sue this liar," Musk wrote on X in response to a report on Khanna's remarks.

Musk, who served as President Donald Trump's top adviser on government efficiency and led DOGE's efforts to identify waste, fraud, and abuse across the federal government before leaving the administration last year, followed up by defending the agency's review of government spending and foreign aid programs.

"The standard applied by DOGE was very simple and easy: Provide contact information for the recipients of aid, so that we can confirm it is not fraudulent," Musk wrote. "The reality is that money was being sent to corrupt politicians under the guise of aid!"

"Liars and stock insider traders like Ro the Robber should be in prison!!" he said.

The pair of posts came after Khanna called for investigations into Musk when Democrats regain control of Congress.

"He needs to be subpoenaed, he needs to face investigation, he needs to answer for what he did with DOGE," Khanna said during an appearance on the "I've Had It" podcast. "It's not just 'let's move on.'"

Khanna also took aim at celebrations surrounding Musk's recent financial windfall following SpaceX's public offering, arguing that Musk should instead face scrutiny over cuts made to the U.S. Agency for International Development (USAID).

"Once we take power, there needs to be accountability," Khanna continued. "There needs to be accountability for Elon Musk."

"They're celebrating that he created 4,400 millionaires, but they don't talk about the 4.5 million children around the world who he possibly sentenced to death by dismantling USAID," he added.

Podcast co-host Jennifer Welch echoed Khanna's criticism, saying she was troubled by praise for Musk's wealth creation while critics contend DOGE-driven spending reductions affected humanitarian programs overseas.

Khanna's attacks on Musk are notable given that Fremont, California — home to Tesla's massive manufacturing facility employing roughly 20,000 workers — lies within his congressional district.

Musk's wealth surged after SpaceX went public, making him the world's first trillionaire and drawing criticism from liberal politicians, commentators, and media figures.

Former New York Times columnist Paul Krugman recently argued that only a "rigged system" could produce such extreme wealth. Commentators on CNN and MSNBC have likewise criticized Musk, with some lamenting that a "white supremacist" had become the world's first trillionaire.

Musk has repeatedly rejected accusations that he is a white supremacist or anti-Semite. In a previous CNBC interview, he dismissed such claims, saying he was "pro-semite, if anything."