Former U.S. President Donald Trump has parted ways with his lead impeachment lawyers little more than a week before his trial, two people familiar with the situation said Saturday. The change injects fresh uncertainty into the makeup and strategy of his defence team.

Butch Bowers and Deborah Barbier, both South Carolina lawyers, have left the defence team in what one person described as a “mutual decision” that reflected a difference of opinion on the direction of the case.

The two people familiar with the legal team discussions insisted on anonymity to discuss private conversations. One said new additions to the legal team were expected to be announced in a day or two.

Bowers and Barbier did not immediately return messages seeking comment.

1:30U.S. Senate sworn in ahead of Trump impeachment trial

Trump is set to stand trial on the week of Feb. 8 on a charge that he incited the riot inside the U.S. Capitol. Republicans and Trump aides have made clear that they intend to make a simple argument: The trial is unconstitutional because Trump is no longer in office.

CNN was first to report the departure of the lawyers.

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Associated Press writer Meg Kinnard in Columbia, South Carolina, contributed to this report.