Defamation Suit About Election Falsehoods Puts Fox on Its Heels

In the weeks after President Donald J. Trump lost the 2020 election, the Fox Business host Lou Dobbs claimed to have “tremendous evidence” that voter fraud was to blame. That evidence never emerged but a new culprit in a supposed scheme to rig the election did: Dominion Voting Systems, a maker of election technology whose algorithms, Mr. Dobbs said, “were designed to be inaccurate.”

Maria Bartiromo, another host on the network, falsely…