Rule 002 just got approved"on an accelerated basis"...Goes into effect Wednesday.
This gives the DTCC the right to initiate intraday checks to make sure institutions are not over-leveraged on their positions, and automates the margin call process if they're not in compliance/deemed to be too risky of a position.
https://www.sec.gov/rules/sro/nscc/2021/34-92213.pdf