you ask can the Treasury continue to do so?
No, not according to Congress: What’s crazy the law is being ignored.
PUBLIC LAW
The Charter Act
The United States prohibition on assessment or collection of fee or charge to Fannie Mae, (section 304 Fee Limitation). Only Federal Reserve Banks are authorized to be reimbursed of fees, (section 309).
Therefore, the FHFA was not given authority by Congress to enter into contract with the United States Treasury in the amount of $200,000,000,000 (two hundred billion dollars): This amount of money is construed as a commitment from the Treasury, a line of credit, backstop. This money was not used to purchase obligations of Fannie Mae as permitted in the HERA legislation under terms as defined by the changes of the company's Charter Act by HERA. The HERA legislation granted temporary authority to the Treasury to purchase obligations of the Enterprise, above the limits written in the Charter, (Charter limitation of 2.25 billion). The SPSPA is an illegal contract that the FHFA forced the companies into with the Treasury.