A Los Angeles attorney has been appointed to defend a ruling by a lower court judge who refused to erase the criminal record of former metro Phoenix Sheriff Joe Arpaio after he was pardoned by President Trump.

The 9th Circuit Court of Appeals on Monday picked Christopher G. Caldwell to argue in support of the ruling that dismissed the lawman's case but refused to expunge his record.

The appointment in the appeal came after President Donald Trump's Justice Department refused to handle the case.

Caldwell worked for the Justice Department in the 1980s and, in private practice since then has focused on cases involving the entertainment industry, intellectual property and other areas.

After the six-term sheriff was defeated in late 2016, he was convicted of criminal contempt of court for his acknowledged disobedience of a judge's 2011 order that barred his traffic patrols that targeted immigrants. Arpaio was accused of prolonging the patrols for 17 months to boost his successful 2012 re-election campaign.

The pardon of the misdemeanor conviction spared Arpaio — an early supporter of Trump's presidential campaign — a possible jail sentence.

Arpaio is appealing the ruling that refused to expunge his criminal record.

Lawyers for the Justice Department won the conviction. But after the pardon, it sided with Arpaio, arguing that the conviction should be expunged because he was pardoned before it became final.