President Biden will deliver a prime-time speech from Philadelphia on Thursday about protecting democracy during which he will warn that Americans’ rights and freedoms are “under attack,” according to a White House official. Biden’s speech at Independence National Historical Park on Thursday evening will revive his 2020 campaign theme of fighting for the “soul of the nation,” according to the White House advisory, and is a sign of his message to voters coming into focus just two months out from the midterm elections. “He will speak about how the core values of this nation — our standing in the world,...