Look at last term’s decisions. Thomas sat on Brnovich v DNC, a voting rights case. Sat on numerous cases where the United States or a federal agency was a party.
Given his wife’s radical positions that the Biden Administration unlawfully assumed office, Thomas should retire. At a minimum, he should recuse himself from hearing voting rights cases or any case where the Executive Branch has submitted a brief.
Link: https://www.supremecourt.gov/opinions/slipopinion/20#list