A House hearing on a proposed gay marriage bill will begin its third day of testimony on Saturday in Hawaii.

Lawmakers announced Friday that the hearing could stretch into Monday.

The measure, Senate Bill 1, has attracted intense interest, with more than 5,000 people signing up to testify before thirty House members from two committees. An additional 15,000 pages of written testimony were submitted ahead of the hearing.

The hearing got underway a day after the Senate overwhelmingly approved the legislation.

But in the House, where votes are tight, the bill is having a rockier ride. House lawmakers opposed to the measure were expected to file amendments seeking to expand the bill's religious exemptions to include businesses.

One witness described the plan to consider the marriage bill during a special session called by Governor Neil Abercrombie “government run amok.”

“Thousands of people came out to the rally against this bill on Monday and sixty percent of the testimonies that were heard that same day were also in opposition. And yet somehow the bill still made it out of committee and passed the Senate yesterday by a vote of 20 to 4,” the witness said. “I get the feeling that it doesn't matter what we say.”

Abercrombie, who signed the state's civil unions bill in 2011, has stated that he called the special session in response to the Supreme Court's June decision striking down the Defense of Marriage (DOMA), which left gay couples in civil unions unable to access federal benefits.

Pressure to act also increased last month after a lawsuit in New Jersey succeeded in forcing the state to allow gay couples to marry. Hawaii is similarly situated to New Jersey. Both states created a separate union specifically for gay couples that is not recognized by the federal government.

A lawsuit challenging Hawaii's marriage laws is currently before the Ninth Circuit Court of Appeals.

(Related: Mass. AG Martha Coakley urges appeal court to strike down gay marriage bans.)