Former President Donald Trump, who is embroiled in a series of legal and political fights, is getting his latest challenge from a core Republican constituency: life anti-abortion activists.

Susan B. Anthony Pro-Life America, an influential conservative group with more than 1 million members, threatened Trump – and any 2024 candidate – that they will lose the organization's support unless they back a national ban on abortion. 

"We will oppose any presidential candidate who refuses to embrace at a minimum a 15-week national standard to stop painful late-term abortions while allowing states to enact further protections," SBA Pro-Life America President Marjorie Dannenfelser said in a statement.