Spending bill is final passed with Pelosi as House speaker
Letter addressed to Majority Leader Chuck Schumer (D-N.Y.)
Lawmaker made history in 2018, becoming first bi member to serve in Senate
Bill passed with bipartisan support
Democrats now control U.S. Senate by 51-49 margin
Some advocates for religious liberty joined forces with LGBTQ groups to play a vital role in passage of the Respect for Marriage Act
Bill approved by 61-36 vote margin
Anti-LGBTQ groups have launched conservative effort to block bill
Bill advanced this week with Republican support
Final U.S. Senate vote could take place Thursday
