A nasty feud over President Donald Trump’s elections overhaul push has further crippled an already-dysfunctional Congress, leaving Republicans unable to move on critical elements of their agenda.

President Trump blew up what could have been a win for his party — and he did it to force lawmakers to pass an elections overhaul bill that has been all but doomed in the Senate.

The president and his conservative allies have stymied other legislation as they unsuccessfully try to pass a voting regulations bill that lacks even simple majority support in…