If Virginia Democrats are looking for help in pressuring Republican Gov. Bob McDonnell to resign, they can rule out the state’s U.S. senators, both of them Democrats and former governors.

Sens. Mark Warner and Tim Kaine shrugged off questions Tuesday into whether McDonnell should step down from office amid a FBI probe into his relationship with businessman Jonnie Williams. Earlier Tuesday, McDonnell vowed to return thousands of dollars worth of gifts from Williams, the CEO of Henrico-based Star Scientific, and last week repaid more than $120,000 in loans Williams made to the McDonnell family.