Washington D.C. Mayor Muriel Bowser has signed an order prohibiting city workers from traveling to North Carolina over a recently approved anti-gay bill.

“I signed an order banning travel to NC for DC Gov employes [sic],” Bowser tweeted last week. “We stand w/ the LGBTQ community & against discrimination.”

North Carolina's House Bill 2 prohibits any city, town or municipality from enacting measures that prohibit discrimination based on sexual orientation or gender identity and bars students attending public institutions from using the bathroom that does not conform to their gender at birth. It effectively nullified an LGBT protections ordinance set to take effect last week in Charlotte.

Bowser joins Chicago Mayor Rahm Emanuel, San Francisco Mayor Ed Lee, Seattle Mayor Ed Murray and New York City Mayor Bill De Blasio in implementing a ban on non-essential travel to the state. The Portland City Council also approved a similar ban.

Several states, including Oregon, Washington, Connecticut and Vermont, have either banned travel or condemned the bill's passage.