President Trump plans to announce on Friday that he will name Kevin Warsh, the former Federal Reserve governor, replace Jerome Powell as Federal Reserve chair, The Post has learned.After meeting on Thursday with Warsh, a former Fed governor and Stanford University professor, Trump later called Warsh and asked him if he would accept the position — and he did, sources tell The Post.Rick Reider, a top executive at giant money manager BlackRock emerged as a top candidate in recent days. But Reider on Thursday w ...