Australian lawmakers are expected to approve amendments to landmark legislation to force Facebook and Alphabet's Google to pay media companies for news content, despite opposition from some minor political parties.

The government introduced amendments to the so-called Media Bargaining Code after Facebook last week escalated a dispute over the new laws by blocking Australian users from sharing and viewing news content on its popular social media platform.

Australia's Senate began debating the amendments on Wednesday. The ruling conservative Liberal Party does not have a majority in the upper house, but support from the opposition Labor Party is expected to be enough to pass the bill.