Sen. Elizabeth Warren is not relenting on Wells Fargo even after former Chief Executive John Stumpf’s decision last week to step down, and is raising questions about his compensation, his replacement, and whether the bank has done enough after the fake accounts scandal.

In a letter sent Thursday to Wells Fargo’s chairman, Warren and Sen. Bob Menendez, D-N.J., said Stumpf’s retirement was “appropriate,” but that they would have problems if Stumpf received a large compensation package or if his successor was connected to the creation of millions of unwanted accounts for customers.