WASHINGTON (AP) — A group of House lawmakers are rallying opposition to a proposed constitutional amendment banning gay marriages — and they’re using Vice President Dick Cheney’s own words to make their point.

In a letter to colleagues, openly gay Rep. Barney Frank (D-Massachusetts) quoted Cheney as saying the same-sex marriage issue is appropriately decided by each state, and not by the federal government.

“I think we ought to do everything we can to tolerate and accommodate whatever kind of relationships people want to enter into,” Cheney said during a vice presidential debate in 2000.

Republican lawmakers are rounding up co-sponsors for a constitutional amendment, favored by Senate Majority Leader Bill Frist (R-Tennessee) that would ban gay marriages nationwide.

The move comes as the Massachusetts Supreme Judicial Court is weighing whether to legalize same-sex unions. The high-profile case, which was filed by seven gay couples denied marriage licenses, has attracted international attention, with advocates on both sides predicting the Massachusetts court could become the first in the nation to legalize gay marriage.

A decision was expected July 14, but the deadline has been extended.

The White House, meanwhile, is reviewing the proposed amendment, as well as other options, including strengthening the Defense of Marriage Act. That law allows states not to recognize same-sex unions from other states.

White House officials have also said that Bush wants to see how the Massachusetts court rules.

In the letter to their House colleagues, Frank, Rep. Tammy Baldwin (D-Wisconsin) and Rep. Jim Kolbe (R-Arizona) said they don’t always agree with Cheney on public policy. But they said his answer during the debate makes a strong case against a constitutional amendment banning gay marriage. Baldwin is the only openly lesbian member of Congress.

“We urge that those who share the vice president’s commitment to federalism ... refrain from sponsoring a constitutional amendment which would repudiate the statement he made here,” said the letter.

Frank has routinely introduced legislation to provide benefits to domestic partners of gay federal employees, but it has not passed.