From Sky News:
Tl;dr version: Nigel Farage’s Brexit Party will not be running candidates for any of the seats that were previously won by the Tories in 2017. Instead, the party will focus on contesting seats held by Labour and the Lib Dems. Now, if Johnson is smart, he will have the Conservative candidates stand down in any seat where it appears that the Brexit Party has the better chance to win.
This is good news for everyone who has been worried that the Tories and the Brexit Party would split their votes and the end result would be Prime Minister Jeremy Corbyn.
Corbyn, who is nothing if not predictable, has labeled this the “Trump Coalition.”
Actually, it’s just smart politics.