Elon Musk has been heavily criticized after writing a series of Tweets ridiculing Bernie Sanders by implying that he couldn’t remember that he is alive.

On Sunday morning, the Tesla owner Tweeted, “I keep forgetting that you’re still alive.”

The Tesla owner targeted the lawmaker on Sunday after he demanded the elite and upper class to pay their “fair share.”

On Saturday, Bernie Sanders, an attorney for redistributing wealth, posted a Tweet saying, “We must demand that the extremely wealthy pay their fair share. Period.”

Soon after his Tweet, the Tesla owner retaliated at the Vermont independent by Tweeting back. He also added a message for Sanders, “Want me to sell more stock, Bernie?” asked Musk “Just say the word …”

When Bernie Sanders mentioned the wealthy citizens, he also meant Elon Musk as well since the Tesla owner with a net worth of $285 billion completely falls under his “the extremely wealthy” description.

On Friday, Elon Musk trust made $1.2 billion over the week from the $6.9 million worth of stocks sale on Friday evening, revealed financial filings.

Yet Musk holds around 166 million shares of the company.

Allegedly the sale of the shares came after Elon Musk posted a toll on Twitter, asking his 60 million Twitter followers whether he should sell 10% percent of the company shares. As per expectations, 58% responded with a positive. He also told his followers that whatever they decide will be the future of the company’s holdings.

However, according to CNBC, the financial documents filed in the previous week revealed that some shares were planned for sale regardless of the poll outcomes.

Lawmakers are seeking to increase taxes for the country’s wealthy citizens.

Last month, a proposal that the U.S. Senate Democrats unveiled said all the tradeable assets, including shares and stocks that billionaires hold, should be taxed to help Biden with sweeping domestic policy package.

Bernie Sanders and Sen. Elizabeth Warren have been the loudest voices demanding the wealthy to pay higher taxes.

In March, they also proposed a proposal to tax 3% on wealth more than $1 billion and 2% on the net value of the households every year range starting from $50 million to $1 billion.