More than 175 members of Congress are calling on President Barack Obama to sign an executive order banning federal contractors from employment discrimination based on sexual orientation and gender identity.

The lawmakers signed on to a letter sent Tuesday by Oregon Senator Jeff Merkley, a Democrat.

“All Americans deserve fairness in the workplace,” Merkley said in an emailed statement. “There is no reason to wait any longer to extend non-discrimination policies to federal contractors and protect millions of Americans from being fired for who they are or who they love.”

Obama has previously called on Congress to approve the Employment Non-Discrimination Act (ENDA), which would protect LGBT workers, arguing that an executive order is not as durable as a law.

The full text of Merkley's letter follows.

“We are writing to urge you to fulfill the promise in your State of the Union address to make this a 'year of action' and build upon the momentum of 2013 by signing an executive order banning federal contractors from engaging in employment discrimination against lesbian, gay, bisexual, and transgender (LGBT) Americans. As you have said before, 'now is the time to end this kind of discrimination, not enable it.'”

“As we continue to work towards final passage of the Employment Non-Discrimination Act (ENDA) with strong bipartisan support, we urge you to take action now to protection millions of workers across the country from the threat of discrimination simply because of who they are or who they love. We are committed to doing all that we can in Congress to get ENDA to your desk this year; however, there is no reason you cannot immediately act by taking this important step. This executive order would provide LGBT people with another avenue in the federal government they could turn to if they were the victim of employment discrimination by a federal contractor. When combined with ENDA, these non-discrimination protections would parallel those that have been in place for decades on the basis of race, sex and religion.”

“An executive order covering LGBT employees would be in line with a bipartisan, decades-long commitment to eradicating taxpayer-funded discrimination in the workplace. In 1941, President Roosevelt prohibited discrimination in defense contracts on the bases of race, creed, color, or national origin. In subsequent executive orders, Presidents Roosevelt, Truman, Eisenhower, Kennedy, and Johnson expanded these protections to ensure that taxpayer dollars are not used to discriminate.”

“In addition, most of the largest government contractors – companies like Boeing, Raytheon, and Lockheed Martin – have LGBT non-discrimination policies in place. They adopted them because business leaders recognize that discrimination is bad for the bottom line.”

“Finally, time is of the essence. Even with an executive order in place, full implementation of these protections will require regulations to be developed and finalized, a process that will take many months, if not longer, to fully put in place.”

“Issuing an executive order prohibiting discrimination against LGBT workers in federal contracts would build on the significant progress for LGBT rights made during your time as President and would further your legacy as a champion for LGBT equality. We urge you to act now to prevent irrational, taxpayer-funded workplace discrimination against LGBT Americans.”