A nonpartisan watchdog group is hoping to find out how Congressman Devin Nunes (R-Calif.) is able to pay for the numerous lawsuits that he’s filing against the media and an online cow.

On Wednesday, the Campaign Legal Center sent a letter to the Office of Congressional Ethics asking them to ā€œinvestigate whether Representative Devin Nunes is receiving free legal services in violation of the Rules of the House of Representatives.ā€

The group also noted, ā€œHouse rules prohibit a Member from receiving free legal services, unless the Member establishes a Legal Expense Fund. According to the House Legislative Resource Center, Representative Nunes has not filed any of the required reports to establish an LEF.ā€

After noting that Nunes has been an especially litigious member of Congress, the letter reads, ā€œThere are three permissible sources of payment for legal services under House rules: a legal expense fund, campaign funds, or Representative Nunes’s personal funds.ā€

ā€œRepresentative Nunes has not disclosed any of the required public reports necessary to establish that he has properly paid for the legal services using any permissible source.ā€

Nunes’ opponent took a swing at him over the CLC letter, saying, ā€œWhile Devin Nunes pays for all these lawsuits, his ignored district is who REALLY pays.ā€

Nunes has leveled a number of lawsuits — he is currently suing CNN, McClatchy and a Twitter account called Devin Nunes’ cow that frequently criticizes the California lawmaker. Nunes is suing the Twitter account for ā€œmalicious harassment, cyberbullying, stalking and defamation,ā€ according to the CLC letter.

One of Nunes’ lawsuits — one against the Washington consulting firm Fusion GPS — was thrown out last week by a federal judge in Virginia. Nunes argued that the firm, which also produced the famous Russia dossier, targeted him after he questioned the veracity of the dossier.