Google, which has long portrayed itself as one of the world’s best workplaces, faces government accusations that it underpays women and is resisting pressure to turn over salary data to disprove them.

The Labor Department sued Google in January after the company refused to submit 19 years of pay data for more than 21,000 employees for a routine audit into its pay practices. The department needs more Google salary data because an initial review of 2015 figures “found systemic compensation disparities against women pretty much across the entire workforce,” according to testimony from a Labor Department official in April.

Google, a unit of Alphabet Inc., says its annual salary analyses show no gender pay gap among its 74,000 employees. “So we were quite surprised” by the Labor Department’s accusations, “which came without any supporting data or methodology,” Google said in an April blog post. Google has declined to release the numbers behind its analyses.

Google argued the Labor Department’s request was overly broad, a violation of its employees’ privacy, and costly to comply with. An administrative law judge at the Labor Department is expected to rule soon.

The department can investigate Google because the company provides advertising and cloud services for the federal government.