The Treasury Department said it will auction $25 billion year bills on Oct. 15.
The 52-week bills are dated Oct. 16 and due Oct. 15, 2015.
The veto means California won't have a new vehicle to fund large-scale infrastructure. Newsom also killed a bill to unwind pension reforms.
Muni yields are succumbing to a "domino effect," said Kim Olsan, portfolio manager at NewSquare Capital.
A three judge panel upheld a lower court rejection of the bondholders' suit against Puerto Rico's central government.
Maryland enters the data center regulation movement as Governor Wes Moore signs an executive order and signals an end to sales tax exemptions.
The selloff in munis this week is "against a backdrop of historic bid wanted in competition volume, continued rate volatility, tax-loss selling [and] unfavorable technicals," said J.P. Morgan strategists.
"We believe strongly in these sectors, and they are poised for even more growth," Bo Daniels, Loop Capital's head of public finance, said in a statement.