Barely having confirmed he will be Donald Trump's nominee for Treasury Secretary, Steven Mnuchin proceeded to roil the bond market when the former Goldman banker told CNBC he would look at extending the maturity of future Treasury issuance, hinting at 50 and 100 Year bonds, which promptly sent long-term US bond yields surging by the most since the turmoil following Trump's election victory.

30-year Treasury yields spiked as much as 12 basis points to 3.06%, after Mnuchin said ultra-long bond sales would be considered. His comments also pushed 5s30s curve from a session low 115bps to above 122bp in just over an hour, rapidly steepening the curve, as the 30Y yield rose as much as 14bp to within 1bp of its YTD high.