The most immediately contentious of the regulator’s proposed rules is a new auction mechanism that would force brokers to offer retail investor orders to a wider group of trading venues if they are less than $200,000. Another proposal, on so-called best execution, would require brokers to document exactly how they had looked at venues to ensure they received the best price for their customers.
“I believe a best execution standard is too important, too central to the SEC’s mandate to protect investors, not to have on the books as commission rule text,” said Gensler, a Democrat nominated by President Joe Biden.
https://www.ft.com/content/8102fc65-0879-4b88-b3c6-097447a61f7d