WASHINGTON—The chair of the Securities and Exchange Commission (SEC) said on Tuesday it will consider new oversight rules for some platforms for trading U.S. Treasuries, in a move aimed at boosting transparency and competition. Gary Gensler said he asked staff to revisit a 2020 proposal issued under the Trump administration intended to treat electronic trading platforms for corporate debt and municipal securities more like stock exchanges. “I’ve asked staff to reconsider (bringing)… certain Treasury trading platforms into the SEC’s regulatory regime and to make recommendations,” said Gensler. Staff would also consider if “other key platforms” could be brought in, he said. Analysts say potential crypto trading platforms could be captured by the new rules. In its 2020 proposal, the SEC said it wanted to better enable regulators to hold firms accountable for technology glitches that affect trading and assess a platform’s preparedness for cyber attacks by mandating data backups in …