evidence: White House chief of staff Ron Klain, the powerful force at the center of Joe Biden's first two years in office, is expected to step down in the weeks after the president's State of the Union address, according to multiple people familiar with his plans. [...] Biden has not settled on a choice for his next White House chief of staff and is discussing casting an even wider net for potential replacements, another official said. The president is known for being deliberative in making major decisions, particularly one as significant as a chief of staff, this official added. [...] Klain then worked as a lobbyist and political adviser and was involved in John Kerry's 2004 presidential campaign. He reprised his role as the vice president's chief of staff early in President Barack Obama's administration, working again for Biden.