CBS Evening News with Norah O'Donnell, 06/05/24

Hunter Biden's ex-wife took the witness stand as prosecutors try to prove the president's son was a drug user when he applied to buy a gun in 2018. Dangerous temperatures are scorching much of the Western U.S., with more than 31 million Americans under excessive heat warnings and advisories. And all U.S. Embassies in the Middle East are on high-alert following an attack today outside the U.S. Embassy in Beirut, Lebanon.