Argentina's Senate begins a touring gay marriage debate on Tuesday, Spanish news agency EFE reported.

The gay marriage bill, approved in May by Argentina's lower house, the Chamber of Deputies (la Camara de Diputados), will be reviewed in the Senate General Law Committee.

The committee is chaired by Liliana Negre de Alonso, who has said that while she disagrees with giving gay and lesbian couples the right to marry, she won't block debate on the issue.

After Tuesday's debut in the Senate, the committee will take its gay marriage debate on the road, with stops planned for the cities of Salta, Tucuman, San Juan and Mendoza starting on June 14, and lasting until June 28. The cities are all provincial capitals and among Argentina's largest by population.

The full Senate is scheduled to take up the bill on July 14, a Wednesday, where the measure faces an uncertain future. The bill has an equal number of supporters and opponents in the chamber, according to a poll conducted by news agency DyN, but 17 senators have remained mum on their position.

Argentine President Christina Fernandez de Kirchner has said she would not block the measure from becoming law, if approved by senators.

Five gay couples have married in the country since December and another 60 have filed court challenges to do the same. Just days before deputies debated the measure, Alejandro Luna and Gilles Grall, a Frenchman, became the fifth gay couple to marry in Argentina.

Committee members on Tuesday will hear testimony from prominent gay rights leaders, including Maria Rachid, president of the Federation of Lesbian, Gay Bisexual and Trans (Federacion de Lesbianas, Gays, Bisexuales y Trans), the group behind many of the gay marriages that have taken place in the South American country.