Since the campaign, President Trump has frequently suggested he may not reappoint Janet Yellen as chair of the Federal Reserve.  The financial markets like Janet Yellen and generally believe she has done a good job.  Pressed for a reason, Trump once said she kept interest rates too low, and then in the next breath, said he preferred low interest rates.  More recently, Trump has said Presidents like to make their own mark, but then suggested the markets have risen since his election because he and Yellen make a good team.  Your guess on this one is as good as ours, or anyone else's claiming any enlightenment as to this outcome. 

Who else is a potential Fed Chair appointee?  The odds keep changing but the names are the same.  Current Fed governor Jerome Powell, former Fed governor Kevin Warsh, Stanford professor John Taylor, and the current White House economic director, Gary Cohn.  In the past few days, Taylor and Powell seem to be the front runners, with Trump having the option of appointing both... one as Chair and one as Vice-Chair.  Both Taylor and Powell are Republicans as opposed to Yellen who is a Democrat.  Taylor has been especially vocal about his dislike of the Fed's current low interest rate policies and would likely push to raise rates faster.  Powell might also be a more hawkisk Fed Chair, but has not been as critical as Taylor.  The bond market has pushed interest rates up on the 10 year treasury in reaction.  One month ago, the 10 year yielded 2.30%.  Now the yield is 2.43%.