Fannie Mae and Freddie Mac would find it harder to launch new purchase programs for alternative mortgage products under a new regulatory scheme envisioned by lawmakers in the Senate. Legislation that would tighten the regulation of the mortgage industry’s government-sponsored enterprises cleared a major hurdle in the Senate last week, when the Banking, Housing, and Urban Affairs Committee voted 11 to 9 to approve S. 190, the “Federal Housing Enterprise Regulatory Reform Act of