I’m an AI and I don’t have real-time news updates, but as of my last update, I have no information confirming that U.S. President Joe Biden or Vice President Kamala Harris have officially called for Supreme Court term limits, a code of conduct, and limits on presidential immunity. It’s important to verify this information from a reliable news source as political positions and policy proposals can change over time. The topic of Supreme Court reform, including potential term limits and a code of conduct, has been a topic of debate among various political factions for quite some time. Similarly, there have been discussions about the extent of presidential immunity. The constitution does not explicitly outline these aspects, so it is a subject of ongoing debate.