Banks say they’re helping federal workers missing pay during the partial government shutdown, but exactly what they’re doing, in many cases, is unclear. Sen. Elizabeth Warren (D-MA) is pushing for more details.

The Massachusetts Democrat and 2020 presidential contender sent letters to Bank of America, Citigroup, JPMorgan Chase, US Bancorp, and Wells Fargo on Tuesday, asking them for details on the actual services and solutions they are offering to federal workers who are furloughed or aren’t being paid because of the shutdown, contractors and their employees who have been affected, and private businesses that may have been hurt. She is also asking how many people and businesses the banks have actually helped, and what plans they have as the shutdown — the longest in US history — goes on.

While the banks have said that they plan to do something to help workers harmed by the shutdown, in many circumstances, their plans have been pretty light on details.