Tesla CEO Elon Musk has responded with a broadside to Twitter's board of directors opposing a proposed takeover by Musk.

"The (Twitter) executive's salary will be $0 if my bid is successful," Musk tweeted Monday.

"So that's $3 million a year we're saving here." Musk responded with the tweet to a post by another user who had criticized the Twitter board.

Musk already owns around nine percent of Twitter and wants to take over the company for around $43 billion.

The Twitter board is not enthusiastic about this and has reacted with a "poison pill": Twitter announced on Friday the launch of a frequently used procedure that is intended to make it difficult for large investors to increase their stake.

According to an insider, the investment company Thoma Bravo, which focuses on the tech industry, has also informed Twitter that it is also examining an offer for Twitter.

However, it is unclear how high this could be and whether it will come at all, said the person familiar with the process.

Thoma Bravo did not want to comment on this.

Twitter shares rose 3.5 percent on Monday to $46.68.

That's well below the $54.20 Musk is offering per share.