"Stepped-up basis" lets billionaires transfer assets without paying taxes. Closing it could help raise more than $320 billion, the White House said.
Biden warned that there is "too much at stake" for Newsom to be recalled and replaced by his main opponent, Trump loyalist Larry Elder.
Biden's move ignited a furious response from GOP lawmakers, many of whom have decried federal mandates as an infringement of individual freedom.
Security officials are assessing the threat level posed by the Washington DC rally, which is expected to draw attendees from far-right extremist groups.
GOP governors and lawmakers are up in arms about forthcoming federal regulations subjecting big employers to vaccine or testing requirements.
"This is not about freedom or personal choice," Biden said as he unveiled a 6-point plan to combat the Delta variant that includes new vaccine mandates.
"I know people who habitually don't watch it live for that reason," a White House official told Politico of Biden's public appearances.
Vice President Harris and second gentleman Emhoff will travel to Shanksville, Pa., for a separate event and later meet the Bidens at the Pentagon.
Khalid Payenda said Afghanistan's economy was "on a freeze." The Afghan currency faces also rapid devaluation, he said during a talk in Washington.
Rep. Markwayne Mullin made several unsuccessful attempts to rescue Americans who hadn't been evacuated before US troops pulled out of Afghanistan.
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Powell faces defamation lawsuits over her baseless claims that widespread election fraud stole the presidency from Donald Trump.
"We leave behind exactly what we went in to solve 20 years ago, and I fear for the future and continuing the war on terror," McConnell said on Sunday.
"There is clearly no plan. There has been no plan. Their plan has basically been happy talk," Sasse said of Biden's Afghanistan withdrawal strategy.
Five of the fallen service members were only 20 years old, having been born shortly before the 9/11 attacks that drove the US to invade Afghanistan.
"Leaving Americans behind and leaving our Afghan friends behind who've worked with us would put upon us and will put upon us a moral stain," he said.