If there is no other probe into Russia’s alleged interference in the 2016 elections, the confirmation hearings for secretary of state nominee Rex Tillerson will be the Senate’s big opportunity to weigh in.

Such an investigation is likely to happen regardless of Tillerson, since Republican congressional leaders have bucked President-elect Trump and requested one. Either way, the Exxon Mobil CEO’s relationship with Russian President Vladimir Putin will likely dominate the hearings.