In a surprise move, President-elect Donald Trump has thrown his support behind a call for the FBI to investigate fellow Republican and former congresswoman Liz Cheney over her involvement in the January 6 panel. The panel, which was established to investigate the events surrounding the January 6, 2021, storming of the US Capitol, has been a point of contention among Republicans.

Cheney, who was one of the few Republicans to vote in favor of impeaching Trump following the January 6 incident, has been a vocal critic of the former President’s actions leading up to the event. Her involvement in the panel has been seen as a betrayal by some Republicans, who have accused her of being disloyal to the party.

Trump, who has a history of using his platform to target his perceived enemies, took to social media to express his support for an FBI investigation into Cheney’s role on the panel. “The FBI should investigate Liz Cheney for her role in the January 6 panel,” Trump wrote. “She is a RINO (Republican in Name Only) and has done great harm to our party.”

It is unclear what specific allegations Trump is referring to, but his call for an FBI investigation is likely to further divide the Republican Party. Cheney has already faced backlash from some Republicans over her involvement in the panel, and an FBI investigation could potentially lead to further repercussions.