The U.S. Senate voted to issue subpoenas to the CEOs of Facebook, Google and Twitter

A committee of the U.S. Senate voted on Thursday to issue subpoenas to the CEOs of Facebook, Google, and Twitter asking them to attend a hearing to prove the importance of legal protection clauses to their online platform business models.

After failing to reach an agreement with the two companies to allow the CEO to attend the hearing voluntarily, the Senate Commerce Committee took coercive measures to require Mark Zuckerberg, Sundar Pichai and Jack Dorsey to testify.

This voting result partly reflects the concerns of lawmakers from both parties about the power of tech giants, especially before the November presidential election day. The committee also plans to ask CEOs their views on federal privacy laws and media integration.