The deficit continues to grow at $500 billion per quarter. Someone has to buy that debt, putting pressure on the yield curve and on the Fed to help moderate its steepness.
The Treasury is holding long-term debt, not buying it, keeping issuance on the short end. The Fed must send a clear message: 'We are not going to manage the yield curve for you.' This is critical early in the term to maintain the Fed's lead on price stability and long-term maximum employment.