Top contenders for the Democratic presidential nomination, including U.S. Sens. Kamala Harris and Elizabeth Warren, turned to Perkins Coie for legal counsel in recent months as they ramped up their bids to take on President Donald Trump in next year’s election, according to new campaign finance disclosures.

After paying the firm $80,000 in the first quarter of the year, Warren’s campaign sent Perkins Coie an additional $240,000 between April and June, the new disclosures show. Several of Warren’s rivals for the Democratic nomination joined her in hiring Perkins Coie in the three-month period ending June 30.