A top Washington lobby shop is telling clients to begin preparing to court a Joseph R. Biden administration chock full of far-left figures and possibly President Trump nemesis Sen. Mitt Romney.

The firm Brownstein Hyatt Farber Schreck forecast that if Mr. Biden wins the White House in November, he’ll likely tap Mr. Romney or former Obama administration diplomat Susan Rice for secretary of state.

Naming Mr. Romney, a Utah Republican and prominent Never Trumper, would offer an olive branch to the GOP establishment if not Mr. Trump’s supporters.