WASHINGTON — The union representing the nation’s immigration judges filed two labor complaints against the Justice Department on Friday, escalating a fight between the Trump administration and those who play a central role in the White House’s attempt to limit immigration to the United States.

The National Association of Immigration Judges, representing the 420 judges overseeing immigration cases in the United States, filed one of the complaints a month after the Justice Department moved to decertify the union.

Another is based off a separate episode in August, when the Justice Department’s executive office for immigration review sent court employees a link to a blog post from a white nationalist website that included anti-Semitic attacks on judges.

The filing is the latest jab in a long-running fight between the outspoken union and the Justice Department, which has pressured the immigration judges to more quickly address a backlog of immigration cases that reached one million this year. Unlike other judges, immigration judges are under the Justice Department as opposed to the judicial branch. The union has long lobbied for its independence.