Opponents of same sex marriage in Alabama will be interested in the plans of Senator Ted Cruz.

Cruz, a Texas Republican, has introduced the State Marriage Defense Act, which prevents the federal government from dictating the definition of marriage on states. The bill comes just days after same-sex unions became legal in Alabama and amid a fight touched off by Supreme Court Chief Justice Roy Moore, who has maintained the federal government should play no role in dictating state law.

It also comes as the Supreme Court is set to hear a case this spring that could decide the issue once and for all.

Cruz's bill has 11 Senate co-sponsors. Included in that list are Alabama Republican Sens. Jeff Sessions and Richard Shelby.

"Even though the Supreme Court made clear in United States v. Windsor that the federal government should defer to state 'choices about who may be married,' the Obama administration has disregarded state marriage laws enacted by democratically-elected legislatures to uphold traditional marriage," Cruz said in a statement.

"I support traditional marriage and we should reject attempts by the Obama Administration to force same-sex marriage on all 50 states."

The bill wouldn't undo existing same-sex marriages. It would, however, nullify existing unions where the members were married in one state and then moved to another where same-sex marriages are illegal.

Cruz said he isn't stopping with just that provision, however, and will introduce further legislation to provide for a constitutional amendment to dictate that the definition of marriage can only be decided by state legislatures.

This isn't the first time Cruz has introduced a similar measure. He tried last year but the Democratic-controlled Senate never brought it to a floor for a vote. The GOP is in charge now and we could see the measure moving ahead.

And, just as a side note, Sessions and Shelby are among seven of the co-sponsors who were in Congress in 2006 and supported legislation at the time to create a constitutional amendment defining marriage as between a man and a woman.