Sen. Chris Van Hollen (D-MD) has a message for the Fed: Get going on a faster payment system now.

“They need to get on the ball and get moving because every day they delay is more money out of the pockets of American consumers,” said Van Hollen in an interview with Yahoo Finance.

This week, Federal Reserve Chairman Jerome Powell noted the United States is “far behind other countries” and told reporters the central bank is “seriously considering” building a real-time payments system.

But Van Hollen and Sen. Elizabeth Warren (D-MA) are trying to force the Fed into action. The senators have introduced legislation, called the Payments Modernization Act, that would require the Fed to build its own real-time payments system. Van Hollen argues consumers are losing billions of dollars every year, because the United States does not have a faster payments system.

The bill aims to make sure more people have access to their money when they need it, essentially enabling consumers to immediately access money that goes to their bank accounts.

“This is especially true for people who are living paycheck to paycheck and they cash their paycheck and the check doesn't clear for a number of days. And in the process they're subject to late fees, overdraft fees if they attempt to access their accounts — or they’re driven for those few days into the hands of payday lenders,” Van Hollen said.

Powell told reporters the Fed has received “overwhelmingly favorable” comments about establishing a real-time payment system. Powell said the Fed has not made a decision about building a real-time payments system, but he expects a decision soon.

On Monday, Federal Reserve Governor Lael Brainard is set to give a speech on payments systems in Kansas City.

“The Fed needs to move from ‘considering’ to action because, you know, the more time goes by, the more the big banks will try to derail this effort,” said Van Hollen.

The private sector is already working on a real-time payments network, and Van Hollen and Warren argue if the Fed doesn’t act it could “result in a de facto monopoly of our payments system by the big banks.”

“Community banks are fearful of giving control of the payment systems to the big banks, because they worry about their access to the system. They appropriately worry about pricing discrimination, and they worry about the monopoly power of the big banks being used to discriminate against the smaller banks — and there are also issues of accountability,” said Van Hollen. “There are a whole host of reasons why this needs to be under the stewardship and control of the Federal Reserve.”