The US lender has been fined £139million by the Consumer Financial Protection Bureau. Trump calls government oversight of US business "excessive" and has called for a pause on new rules and a review of existing regulations.
Miller said she watched with dismay as Wells Fargo increased her branch's sales goals and lowered bonuses for meeting the new targets.
Federal regulators said Wells Fargo secretly opened accounts and shifted money from costumers' accounts into the new accounts without their knowledge or permission, often racking up fees or other charges. "It's yet another example of how much is at stake in this election".
An internal review by Wells Fargo revealed that there were more than 1.5 million deposit accounts "that may not have been authorized", possibly funded "transferring funds from consumers' existing accounts without their knowledge or consent".
The largest USA bank by market capitalization will pay $185 million in penalties and $5 million to customers that regulators say were pushed into fee-generating accounts they never requested.
A staggering 5,300 employees at Wells Fargo were fired in connection with this behavior, according to the Los Angeles City Attorney's office.
Before it's here, it's on the Bloomberg Terminal. Accounts she paid interest on before realizing what was happening. But in the case of Wells Fargo, banking specialists, analysts and investors say the damage may be just starting.
Even more concerning, has this thinking taken root in other banks and financial institutions?
In a statement on Thursday, Wells Fargo said it has set aside $US5 ($7) million for refunds to customers, 100,000 of whom have already been repaid.
"We regret and take responsibility for any instances where customers may have received a product that they did not request", Wells Fargo said.
Miller, the former Wells Fargo banker in Pennsylvania, was among those who testified.
During the second three months of this year, Wells Fargo said its customers held an average of 6.27 products per household. It's what Wells Fargo calls the "Gr-eight initiative".
Wells Fargo says the primary driver of its branch workers' compensation is their salaries, with variable pay ranging from 3 to 15 percent of their total compensation.
"Not only is this conduct appalling and harmful to American consumers and communities, it also contributes to the growth of excessive regulation that needlessly burdens the local community banks that do right by their customers", said Camden R. Fine, president of the Independent Community Bankers of America. They include disciplinary action, including termination of managers and team members who took actions counter to its values; investments in training, monitoring and controls; strengthened performance measures; and adding the step of sending customers a confirming email within one hour of opening any deposit account and sending an application acknowledgment and decision status letter after submitting an application for a credit card, the bank says.