You can read the letter here. It begins:

We the undersigned, nonpartisan staff members of the Federal Election Commission (FEC) affirm our commitment to make our workplace a model of inclusion and equal opportunity for all, regardless of racial, class, gender, or other differences. To give voice to our shared belief that equity is a vital component of a healthy workplace, and in order to address the historical lack of racial diversity at the top ranks of our agency, we write in our personal capacities to ask the White House to nominate and the United States Senate to confirm people of color to serve as FEC Commissioners.