JPMorgan Chase ended its banking relationship with Polymarket last October over regulatory concerns, according to people familiar with the matter.

The move adds fuel to Washington fights over debanking and growing scrutiny of prediction markets’ business practices, though the bank still maintains ties to Polymarket and other firms. A Polymarket spokesman said the company keeps “a close, active relationship with JPMorgan across multiple entities.” Chief Executive Shayne Coplan has spoken at 3 of the bank’s events in the past year, the spokesman added. The decision reflects heightened regulatory scrutiny of prediction markets, which have drawn attention from lawmakers and watchdogs.

A large investor linked Polymarket to major banks such as Citigroup and Fifth Third earlier this year, with initial meetings going well, a source said. The investor hoped to secure access to larger banks through smaller ones they already worked with. Citigroup and Fifth Third did not comment.

JPMorgan was already in the Trump administration’s crosshairs for alleged debunking, or closing accounts for political reasons. The president ordered regulators to probe alleged “politicized or unlawful debanking” and act accordingly. Last month, JPMorgan was subpoenaed by the Justice Department along with other banks.