Donald Trump is signaling that he’s not taking any delegates for granted as he tries to gather the 1,237 required to clinch his party’s presidential nomination.

The billionaire Republican front-runner’s campaign said Monday it was planning to file a formal complaint with the Republican National Committee contesting how Louisiana will allocate its delegates. In a further sign of the possible battles yet to be fought over delegates, Trump hired veteran strategist Paul Manafort, who helped manage the convention fight for President Gerald Ford during the contested 1976 Republican convention, the New York Times reported.

…

It’s unclear what Trump plans to do if the RNC rejects his challenge. Trump might not have a chance of winning in court, but a lawsuit—even the threat of one—can still play an important role in his campaign, said Nate Persily, a professor at Stanford Law School.

“It plays into an outsider narrative about taking on the establishment,” Persily said.