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Biden gives a foreign policy speech in New York in July. Photo: Spencer Platt/Getty Images

DETROIT, Mich. — The biggest lesson Joe Biden learned from the first debate is that there are no rules of engagement at these things, and he's ready to throw down at tonight's debate, according to five senior campaign officials.

What to watch: Yes, he's going to keep contrasting himself with President Trump. But he's squarely focused on Sen. Kamala Harris, too, after the first debate in Miami.

  • "We’re not joking when we say he’s not going to let his record be mischaracterized," said one senior campaign official. "It’s not OK to label someone as a racist."
  • They were referring to Harris' line to Biden at the last debate that started with: "I know you're not racist, but ... "
  • "Some folks are willing to go places we didn’t think they’d go,” said another senior Biden campaign official, who said they were surprised by Harris' exchange with him because she's been friends with Biden for years.
  • His team maintains he won't make any personal attacks against other Democrats, but Biden himself has said he won't be as "polite" as last time.

Why it matters: Any time Biden has to spend defending his record from other candidates' attacks is less time he'll have to take on Trump — something he's been doing since he launched his campaign, signaling he views himself as the eventual nominee.

Between the lines: Although Harris saw a bump in polling after her spat with Biden, his team believes that was temporary.

  • "This is not a new dynamic," said one senior Biden campaign official. "You see candidates who rise and the balloon pops once there’s more information on that person."
  • After the Miami debates, Harris reached 20% in a Quinnipiac poll, but she's since leveled back out at around 11%.

Health care dominated last night's discussion, which Biden watched, and he plans to present that as one of the major differences between himself and Harris, as well as Sen. Bernie Sanders.

The bottom line: Biden might be ready for a fight, but Harris is surely not the only one to go after him and his record, and that could introduce new vulnerabilities he's not yet anticipating.

Go deeper: Democrats prepare for debate brawl with Biden.

Go deeper

McConnell, McCarthy say 2017 tax law is "red line" in infrastructure talks

The top Republicans in the House and Senate told reporters after meeting with President Biden at the White House that "there is a bipartisan desire to get an outcome" on an infrastructure package, but stressed that revisiting the 2017 tax cuts is a "red line."

Why it matters: Wednesday marked the first time that Biden has hosted Senate Minority Leader Mitch McConnell (R-Ky.) and House Minority Leader Kevin McCarthy (R-Calif.) at the White House.

McCarthy: "I don't think anybody is questioning the legitimacy" of Biden's win

House Minority Leader Kevin McCarthy (R-Calif.) was asked Wednesday whether he was concerned about elevating Rep. Elise Stefanik (R-N.Y.) to GOP leadership after she has promoted baseless claims about the election. He responded: "I don't think anybody is questioning the legitimacy of the presidential election."

Why it matters: Rep. Liz Cheney (R-Wyo.) was ousted as House GOP conference chair earlier Wednesday — in a vote that McCarthy supported — over her continued criticisms of former President Trump and his lies about election fraud.

Updated 1 hour ago - World

Gaza crisis: Casualties pile up with no signs of ceasefire from Israel, Hamas

Palestinians in the Gaza Strip leave their neighborhood on Wednesday following an explosion. Photo: li Jadallah/Anadolu Agency via Getty Images

Tel Aviv — With Israel and Hamas now engaged in their most destructive fight in seven years, the Biden administration is dispatching a State Department official to join the de-escalation efforts.

The latest: The Israeli air force attacked a meeting of senior Hamas military leaders on Wednesday in Gaza and reported it had killed the Gaza City Brigade commander and the heads of Hamas’ cyber arm and weapons research and development department, along with at least three other senior officials.